Hierarchy Of Difficulty Research Articles

Characterizing social communication among minimally verbal children with autism: An application of item response theory.

Minimally verbal children constitute a portion of the autism spectrum. The paucity of proper measurement tools that sensitively and accurately assess behaviors has been one limiting factor in the improved knowledge of these children. Short of creating and validating a new measurement tool for this subpopulation, this study took an alternative and more immediate approach: conduct a secondary data analysis and examine an existing social communication measure, the Early Social Communication Scales (ESCS), with item response theory. The final sample consisted of 453 minimally verbal children culled from four different completed studies. The IRT models analyzed the frequency of social communication gestures from the ESCS and returned an objective difficulty hierarchy regarding initiations of joint attention and behavior regulation gestures. The best-fitting and final model was a zero-inflated negative binomial model (ZINBM), which determined that joint attention gestures were, on average, more difficult than behavior regulation gestures. Joint attentional shows and gives were essentially absent in the children's repertoire, and behavior regulation reaches were the easiest gestures for this sample. The ZINBM separately modeled children with some gestures and children who did not present with any gestures and determined that behavior regulation reaches and gives were likely the first gestures a child will eventually exhibit among children with no gestures. Methodological contributions and potential future applications of IRT are discussed.

Activities-specific balance confidence scale: a Rasch evaluation of the Arabic version in lower-limb prosthetic users

Purpose To evaluate the psychometric properties of the Arabic version of the Activities-Specific Balance Confidence Scale using the 5-option response categories for individuals with lower limb amputation (ABC-5/Ar). Materials and methods This was a methodological study on a convenience sample of individuals with unilateral lower-limb amputation attending outpatient rehabilitation centres in Saudi Arabia and Turkey (N = 155). Rasch analysis (WINSTEPS version 4.6.5) was used to examine the 5-categories rating scale structure, item fit, item difficulty hierarchy, person separation index, unidimensionality, local item dependency, and differential item functioning. Results The ABC-5/Ar 5-response option demonstrated an appropriate model fit. Most items fit the Rasch model, except for item #12 “walk in a crowded mall,” which showed an overfitting value of 0.63. The person separation indices 2.95 (Cronbach’s α = 0.96). Principal component analysis of residuals confirmed the unidimensionality of the scale; however, local dependency was detected between item #14 “Ride in escalator holding rail,” and item #15 “Ride in escalator not holding rail.” Conclusions The findings suggest that the ABC-5/Ar shows promise in assessing balance confidence in Arabic-speaking lower-limb prosthesis users. However, further studies with larger sample sizes and in diverse clinical contexts are needed to confirm its effectiveness in various clinical settings.

Validation of the Maslach Burnout Inventory-General Survey 9-item short version: psychometric properties and measurement invariance across age, gender, and continent.

The Maslach Burnout Inventory-General Survey (MBI-GS) stands as the preeminent tool for assessing burnout across various professions. Although the MBI-GS9 emerged as a derivative of the MBI-GS and has seen extensive use over several years, a comprehensive examination of its psychometric properties has yet to be undertaken. This study followed the Standards for Educational and Psychological Testing guidelines to validate the MBI-GS9. Employing a combined approach of classical test theory and item response theory, particularly Rasch analysis, within an integrated framework, the study analyzed data from 16,132 participants gathered between 2005 and 2015 by the Centre for Organizational Research at Acadia University. The findings revealed that the MBI-GS9 exhibited satisfactory reliability and validity akin to its predecessor, the MBI-GS. Across its three dimensions, Cronbach's α and omega coefficients ranged from 0.84 to 0.91. Notably, the MBI-GS9 displayed no floor/ceiling effects and demonstrated good item fit, ordered threshold, acceptable person and item separation and reliability, clear item difficulty hierarchy, and a well-distributed item threshold. However, the results suggested a recommended minimum sample size of 350 to mitigate potential information loss when employing the MBI-GS9. Beyond this threshold, the observed mean difference between the MBI-GS and MBI-GS9 held minimal practical significance. Furthermore, measurement equivalence tests indicated that the MBI-GS9 maintained an equivalent three-factor structure and factor loadings across various gender, age, and continent groups, albeit with inequivalent latent values across continents. In sum, the MBI-GS9 emerges as a reliable and valid alternative to the MBI-GS, particularly when utilized within large, diverse samples across different age and gender demographics. However, to address potential information loss, a substantial sample size is recommended when employing the MBI-GS9. In addition, for cross-cultural comparisons, it is imperative to initially assess equivalence across different language versions at both the item and scale levels.

Second Language Learning Difficulty of Chinese Grammar: A Rasch Analysis of Teachers’ Perceptions

Abstract This study examined second language (L2) learning difficulty of 13 Chinese grammatical constructions on the basis of teachers’ perceptions and associated the L2 learning difficulty of Chinese grammatical constructions with teacher-perceived learner grammatical competence and with the instructional levels. A total of 77 experienced teachers were invited to rate the learning difficulty of 13 Chinese grammatical constructions with reference to L2 learners at four instructional levels at college. Utilizing the Rasch rating scale model, this study established an L2 Chinese grammar learning difficulty hierarchy and revealed that the learning difficulty hierarchy mostly overlapped with the acquisitional order of Chinese grammar found in L2 Chinese research and with the instructional order in a widely used Chinese textbook. This study enriches our understanding of the multifaceted nature of L2 learning difficulty and the idiosyncratic learning difficulty and pattern associated with each Chinese grammatical construction in L2 development. Implications for Chinese instruction, material development, and assessment are provided.

The assisting hand assessment for children and youth with brachial plexus birth injury: a study of validity and item hierarchy of AHA-Plex.

Functional assessments that focus on activity performance and that produce valid outcome measures for people with brachial plexus birth injury are lacking. The primary aim of this study was to re-evaluate the internal scale validity of the Assisting Hand Assessment specifically for children and adolescents with brachial plexus birth injury. Two further aims were investigating whether the scale could be shortened for this group while maintaining psychometric quality, and exploring and presenting its item difficulty hierarchy. A cross-sectional psychometric study. A convenience sample of 105 children and adolescents (aged 18 months to 18 years, mean 6 years, 7 months, standard deviation (SD) 4 years, 4 months) from Sweden, Norway, and the Netherlands with brachial plexus birth injury. Participants were assessed with the Assisting Hand Assessment. Data were analysed with Rasch measurement analysis. The 20 Assisting Hand Assessment items together measured a unidimensional construct with high reliability (0.97) and the 4-level rating scale functioned well. Item reduction resulted in 15 items with good item fit, unidimensionality, reliability and acceptable targeting. Assisting Hand Assessment for people with brachial plexus birth injury, called AHA-Plex, has 15 items and good internal scale validity. A unique item hierarchy for people with brachial plexus birth injury is presented.

Structural validity of the Trunk Assessment Scale for Spinal Cord Injury (TASS) with Rasch analysis for individuals with spinal cord disorders

Objective To confirm the structural validity of the Trunk Assessment Scale for Spinal Cord Injury (TASS). Participants and Methods We evaluated 104 Japanese individuals with a spinal cord injury (SCI) (age 63.5 ± 12.2 years; 64 with tetraplegia) with the TASS 1−3 times. We conducted a Rasch analysis to assess the TASS’ unidimensionality, fit statistics, category probability curve, ceiling/floor effects, local independence, reliability, and difference item function (DIF). Results The TASS was observed to be a unidimensional and highly reproducible scale of item difficulty hierarchy that sufficiently identifies the superiority of the examinee's ability. The TASS was easy for the participants of this study. One TASS item was a misfit based on the infit and outfit mean square; another item also showed a DIF contrast for age. Several items were found to require a synthesis or modification of the content. The TASS showed a floor effect, and most of the non-scorers were individuals with a complete SCI. Conclusion Our findings clarify the structural validity of the TASS, and our analyses revealed that the TASS includes an unfitness item and was less challenging for individuals with SCIs. The improvements suggested by these results provide important information for modifying the TASS to a more useful instrument.

Item Level Psychometrics of the Dizziness Handicap Inventory in Vestibular Migraine and Meniere's Disease.

Evaluate the measurement properties of the Dizziness Handicap Inventory (DHI) using item response theory in patients diagnosed with vestibular migraine (VM) and Meniere's disease (MD). One hundred twenty-five patients diagnosed with VM and 169 patients diagnosed with MD by a vestibular neurotologist according to the Bárány Society criteria in two tertiary multidisciplinary vestibular clinics and who completed the DHI at their initial visit, were included in the study. The DHI (total score and individual items) was analyzed using the Rasch Rating Scale model for patients in each subgroup, VM and MD, and as a whole group. The following categories were assessed: rating-scale structure, unidimensionality, item and person fit, item difficulty hierarchy, person-item match, and separation index, standard error of measurement, and minimal detectable change (MDC). Patients were predominantly female (80% of the VM subgroup and 68% of the MD subgroup) with a mean age of 49.9 ± 16.5 years and 54.1 ± 14.2 years, respectively. The mean total DHI score for the VM group was 51.9 ± 22.3 and for the MD group was 48.5 ± 26.6 ( p > 0.05). While neither all items nor the separate constructs met all criteria for unidimensionality (i.e., items measuring a single construct), post hoc analysis showed that the all-item analysis supported a single construct. All analyses met the criterion for showing a sound rating scale and acceptable Cronbach's alpha (≥0.69). The all-item analysis showed the most precision, separating the samples into three to four significant strata. The separate-construct analyses (physical, emotional, and functional) showed the least precision, separated the samples into less than three significant strata. Regarding MDC, the MDC remained consistent across the analyses of the different samples; approximately 18 points for the full analyses and approximately 10 points for the separate construct (physical, emotional, and functional). Our evaluation of the DHI using item response theory shows that the instrument is psychometrically sound and reliable. The all-item instrument fulfills criteria for essential unidimensionality but does seem to measure multiple latent constructs in patients with VM and MD, which has been reported in other balance and mobility instruments. The current subscales did not show acceptable psychometrics, which is in line with multiple recent studies favoring the use of the total score. The study also shows that the DHI is adaptable to episodic recurrent vestibulopathies. The total score shows better precision and separation of subjects in up to four strata compared to the separate construct that separate subjects into less than three strata. The measurement error smallest detectable change was found in our analysis to be 18 points, which means any change in the DHI of less than 18 points is not likely to be clinically significant. The minimal clinically important difference remains indeterminate.

Measuring Gatekeeper Instructor Comfort to Inform Suicide Prevention Train-The-Trainer Recruitment & Training in Agricultural Communities

ABSTRACT Farmers experience psychological distress and suicide at consistently higher rates than workers in other industries. A gatekeeper is an individual who has been trained to recognize warning symptoms of possible suicidal ideations in others. Gatekeeper programs are recognized by the federal Substance Abuse and Mental Health Services Administration as a best practice for suicide prevention. While gatekeeper programs offer promise to addressing the increasing worldwide suicide rate, how to develop these networks in communities with largely ingrained stigma and taboo related to mental health and suicide remains unanswered. Three of this study’s researchers were part of the development and pilot of an agricultural community gatekeeper program and questioned how gatekeeper instructor psychological comfort could be conceptualized and operationalized for the purpose of informing gatekeeper instructor recruitment and training. After a thorough review of the literature, the researchers constructed a conceptual developmental model of gatekeeper instructor comfort and created a Gatekeeper Instructor Comfort Measure instrument which was then piloted with Kentucky K-12 and university agricultural educators. The researchers of this study employed the Rasch model to determine whether the developmental model of gatekeeper instructor comfort held together empirically. Infit and outfit mean squares (0.73 to 1.33) indicate that the items measure one construct, or are unidimensional, while person reliability and separation statistics indicate that the Gatekeeper Instructor Comfort Measure is composed of enough items to differentiate respondents into almost four strata of gatekeeper comfort. The Gatekeeper Instructor Comfort Measure’s fit to the Rasch model indicates that the instrument meets the requirements of invariant measurement and should serve as a useful measure for other researchers. The instrument’s item difficulty hierarchy also serves as a guide for those training gatekeepers on how to target different gatekeeper outcomes sequentially or developmentally. Researchers recommend restructuring item responses to enable greater discrimination between categories and then piloting the instrument again with a more diverse sample. The revised measure could be used pre- and post-gatekeeper instructor training to determine the impact of training on gatekeeper comfort.

ACTFL Chinese reading proficiency guidelines: Verifying the difficulty hierarchy

The ChallengeThe ACTFL Proficiency Guidelines play a guiding role in foreign language teaching, testing, curriculum design, and textbook development. However, can the difficulty hierarchy posited by descriptors in the Guidelines be verified empirically? How to verify it by scaling teachers' collective perceptions of descriptor difficulty?

Measuring global activity performance in children with cerebral palsy in West Africa: validation of an adapted version of the ACTIVLIM-CP questionnaire

Purpose To calibrate a West-African version of the ACTIVLIM-CP questionnaire (ACTIVLIM-CP-WA) for children with cerebral palsy (CP). Materials and Methods We recruited 287 children with CP of various age range: 2–6 years (n = 117, preschoolers), 6–12 years (n = 96, children) and 12–19 years (n = 74, adolescents). Caregivers of children of each age range completed the experimental version of the ACTIVLIM-CP-WA including 76 (preschoolers), 78 (children) and 76 (adolescents) global daily life activities. Responses were analyzed using the Rasch RUMM2030 software. Results The final West-African version of ACTIVLIM-CP including 31 items (both common and age-specific items) defined a unidimensional, linear scale with well-discriminated response categories. It presented a high internal consistency (R = 0.94). Moreover, all items were locally independent and the item difficulty hierarchy was invariant regarding caregivers’ education, children’s age and gender, MACS and GMFCS levels. The ACTIVLIM-CP-WA measures were significantly correlated (p < 0.05) with Gross Motor Function Classification System (ρ = −0.77), Manual Ability Classification System (ρ = −0.75), Box and Block test (dominant hand r = 0.51; non-dominant hand r = 0.49), One-minute walking test (r = 0.28), and Timed up and Go test (r = −0.40). Conclusions The ACTIVLIM-CP-WA questionnaire provides a valid and reliable tool that has the potential to follow children’s evolution and quantify changes consecutive to neurorehabilitation in Sub-Saharan Africa. IMPLICATIONS FOR REHABILITATION The West-African version of the ACTIVLIM-CP questionnaire (ACTIVLIM-CP-WA) measures global activities requiring a combination of lower and upper extremities in children with cerebral palsy. As a Rasch-built scale, measures are unidimensional and linear to document changes in children with cerebral palsy from 2 to 19 years in Sub-Saharan Africa. Rehabilitation professionals are encouraged to use the ACTIVLIM-CP-WA questionnaire as a psychometrically robust assessment tool measuring the global performance in daily life activities in children with cerebral palsy in Sub-Saharan Africa.

As-Shu’ûbah al-Lughawiyyah Wafqa Haramiyyati Hector Hammerly bi Istikhdâm Moodle

This research aims to know the linguistic difficulty of intermediate level students based on the difficulty hierarchy of Hector Hammerly (1986). By knowing the difficulty that students face, it will be easier for teacher to assign the appropriate step or method in teaching. By knowing the degrees of that difficulty, the teacher can focus attention on addressing the students' difficulty. Thus, the distribution of attention and focus in teaching a subject of grammar is balanced. The study was conducted for intermediate level students, the intensive program for teaching Arabic in the academic year 2021/2022. The researcher obtained the study data by conducting a test for the students and presented them with questions that were determined from grammatical and morphological topics, given Hammerley's classification of grammatical difficulty. The test results were obtained using the Moodle Learning Management System to facilitate the process, speed classification of results and flexibility of test for students. The researcher reached results that the grammatical difficulty of intermediate students differs according to Hammerley's hierarchical difficulty in grammatical difficulty.

Rasch Analysis of the Stroke Impact Scale–16

Because the psychometric evidence supporting the use of the Stroke Impact Scale-16 (SIS-16) is limited, an examination of its psychometric properties is warranted. To evaluate the psychometric properties of the SIS-16 using Rasch analysis. Secondary data analysis of responses to the SIS-16 from the published Field Administration of Stroke Therapy-Magnesium Trial database. Emergency medical system agencies and acute care receiving hospitals. A total of 1,010 people with stroke. We examined the item difficulty hierarchy, item fit, person-item match, separation index, person reliability coefficient, and ceiling and floor effect of the SIS-16. The item "climb a flight of stairs" was the most difficult, and "sit without losing balance" was the easiest. Four items misfit the Rasch partial-credit measurement model. Overall, the average patient ability estimate of 2.1 logits (SD = 2.0) was higher than the average item difficulty estimate of 0.0 logits (SD = 1.1). With a separation index of 2.85, the SIS-16 can differentiate people into 4.1 statistically distinct strata. The person reliability coefficient was .89. Given that 24.2% (n = 244) obtained the maximum score and 0.2% (n = 2) obtained the minimum score, the SIS-16 had a ceiling effect in this patient sample. Results partially support the validity and clinical use of the SIS-16 in subacute stroke clinical settings. Further research is warranted to examine the psychometric properties of the SIS-16 in patients with chronic stroke. What This Article Adds: Our results partially support the use of the SIS-16 in clinical and research settings.

Impact of Event Scale-6 (IES-6) for U.S. adults who experienced the COVID-19 pandemic

BackgroundCOVID-19 pandemic causes psychological problems such as stress. It is important to accurately identify the level of stress and establish effective intervention. The Impact of Event Scale-6 (IES-6) is widely used for post-traumatic stress disorder (PTSD) screening by measuring the level of subjective stress, but there has been no research on its psychometric properties with individuals who experienced the COVID-19 pandemic.MethodsA random sample of 600 participants were randomly selected from a COVID-19 survey database (n = 6391). Rasch analysis was conducted to examine item fit, rating scale structure, construct validity, differential item functioning (DIF), and precision of the IES-6.ResultsThe principal component analysis of Rasch residuals (54.1% of the raw variance explained) and the average of residual correlations (average r = .19) supported the unidimensionality structure in the IES-6. The rating scale was suitable, and the item difficulty hierarchy was logical. The item fit and the DIF contrast were acceptable, except for item 5. The IES-6’s person reliability was .76, which was also an acceptable level.ConclusionsThis study showed that the IES-6 has acceptable item-level psychometrics for screening the stress level in adults in the United States for individuals who have experienced the COVID-19 pandemic. The findings suggested that the IES-6 would be useful for the rapid identification of the high-level stressand allow clinicians to quickly provide interventions for people with the COVID-19 related stress and their families.

Item-level psychometrics of the Ascertain Dementia Eight-Item Informant Questionnaire.

The aim of this study is to evaluate the item-level psychometrics of the Ascertain Dementia Eight-Item Informant Questionnaire (AD-8) by examining its dimensionality, rating scale integrity, item fit statistics, item difficulty hierarchy, item-person match, and precision. We used confirmatory factor analysis and the Rasch rating scale model for analyzing the data extracted from the proxy versions of the 2019 and 2020 National Health and Aging Trends Study, USA. A total of 403 participants were included in the analysis. The confirmatory factor analysis with a 1-factor model using the robust weighted least squares (WLSMV) estimator indicated a unidimensional measurement structure (χ2 = 41.015, df = 20, p = 0.004; root mean square error of approximation = 0.051; comparative fit index = 0.995; Tucker-Lewis Index = 0.993;). The findings indicated that the AD-8 has no misfitting items and no differential item functioning across sex and gender. The items were evenly distributed in the item difficulty rating (range: -2.30 to 0.98 logits). While there were floor effects, the AD-8 revealed good reliability (Rasch person reliability = 0.67, Cronbach's alpha = 0.89). The Rasch analysis reveals that the AD-8 has excellent psychometric properties that can be used as a screening assessment tool in clinical settings allowing clinicians to measure dementia both quickly and efficiently. To summarize, the AD-8 could be a useful primary screening tool to be used with additional diagnostic testing, if the patient is accompanied by a reliable informant.

Refining the psychometric properties of the Trinity Student Occupational Performance Profile – A self-report measure of occupational performance difficulties within the student role

Introduction Navigating the transition to university can pose occupational performance difficulties for students with mental health disabilities including those on the autism spectrum or with attention deficit hyperactivity disorder. This study aimed to refine the Trinity Student Occupational Performance Profile (TSOPP) – a self-report measure of occupational performance difficulties within the student role for students with mental health disabilities which is based on the Person-Environment-Occupation model. Method Data from 667 files were gathered from two Irish universities. Rasch analyses were conducted on the measure’s item-sets (i.e. Person N = 30; Environment N = 20; Occupation N = 24) and on an item-set which combined all 74 items. All item-sets were assessed for fit, rating scale functioning, dimensionality, reliability and separation indices. Results The TSOPP demonstrated stronger psychometric properties as a combined item-set which measures the ultimate construct of occupational performance difficulties within the student role. The 6-point scale was collapsed into a 4-point scale and 20 redundant items were removed. The item difficulty hierarchy provided empirical evidence for occupational performance difficulties in the student role. Conclusion The TSOPP is a valid and reliable self-report measure of occupational performance difficulties within the student role for students with mental health disabilities in higher education.

Determining the Optimal Virtual Reality Exergame Approach for Balance Therapy in Persons With Neurological Disorders Using a Rasch Analysis: Longitudinal Observational Study.

BackgroundVirtual reality (VR) exergames have gained popularity in the rehabilitation of persons with neurological disorders as an add-on therapy to increase intensity of training. Intensity is strongly dependent on the motivation of the patient. Motivation can be increased by delivering variation within training and challenging exercises. However, patients are often underchallenged, as exergame difficulty often does not match the patient’s ability. A Rasch analysis can establish hierarchy of exergame items in order to assist the delivery of patient-centered therapy.ObjectiveThe aim of this study was to apply the Rasch model to create a hierarchical order of existing VR balance exergames and to relate these exergames to the abilities of persons with neurological disorders, in order to deliver challenge and variation.MethodsA total of 30 persons with stroke and 51 persons with multiple sclerosis (MS) were included in the study. All participants performed a training program, lasting 3 weeks for persons with MS and 4 weeks for persons with stroke, in which they performed VR balance exergames with a movement recognition–based system (MindMotion GO; MindMaze SA). VR exercise scores, Berg Balance Scale scores, and clinical descriptive data were collected. Berg Balance Scale and device scores were analyzed with the Rasch model using a repeated-measures approach to examine whether the distribution of exercise scores fitted the Rasch model. Secondly, a person-item map was created to show the hierarchy of exercise difficulty and person ability.ResultsParticipants completed a selection of 56 balance exercises (ie, items), which consisted of a combination of various balance tasks and levels (ie, exercises). Using repeated measures, this resulted in a count of 785 observations. Analysis showed strong evidence for unidimensionality of the data. A total of 47 exercises (ie, items) had a sufficiently good fit to the Rasch model. Six items showed underfit, with outfit mean square values above 1.5. One item showed underfit but was kept in the analysis. Three items had negative point-biserial correlations. The final model consisted of 47 exercises, which were provided for persons with low to moderate balance ability.ConclusionsThe VR exercises sufficiently fitted the Rasch model and resulted in a hierarchical order of VR balance exercises for persons with stroke and MS with low to moderate balance ability. In combination with the Berg Balance Scale, the results can guide clinical decision-making in the selection of patient-focused VR balance exercises.Trial RegistrationClinicalTrials.gov NCT03993275; https://clinicaltrials.gov/ct2/show/NCT03993275

Second language acquisition of Spanish prosody by Chinese speakers: Nuclear contours and pitch characteristics

Despite the increasing number of studies in L2 prosody, little research has been carried out on the Chinese-Spanish language pair. This article sets out to examine the L2 acquisition of nuclear contours and pitch implementation details of Spanish spoken by Chinese speakers. To this end, 555 utterances (produced by 37 informants) were analyzed within an autosegmental-metrical framework, and pitch values were evaluated using long-term distributional (LTD) and pitch dynamism quotient (PDQ) measures. The results suggest a hierarchy of difficulties in acquiring the prosodic features of different sentence types. The most salient intonational error made by the Chinese learners was the tendency to replace low nuclear accents with high/rising tones. Furthermore, the higher pitch level, narrower span, and lower F0 variance found for Chinese speakers lend support to previous hypotheses which proposed a general pitch compression pattern for L2 speech. Nevertheless, with increasing proficiency in Spanish, learners appear to develop more target-like intonation contours and pitch profiles. Finally, gender and stress effects as well as other interactions prove that L2 prosody learning is more complex than previously stated, and is influenced not only by the L1 system and oral competence but is also correlated with some psychological and sociocultural factors.

EFL Learners' Receptive Knowledge of Derived Words: The Case of Swedish Adolescents

AbstractThe study investigated how well Swedish adolescents recognize the meaning of derived words in English and whether this knowledge is determined by learner proficiency, word frequency, or affix type. Participants were 88 school students in two proficiency groups: 39 advanced 12th graders and 49 intermediate 9th graders. Two tests of receptive vocabulary knowledge were administered. The first test had 80 basewords (e.g., maintain) representing the 8,000 most frequent words. The second test had 60 words that were derived from the first test (e.g., maintainable). Results showed that participants’ knowledge of basewords extended to knowledge of derived words quite well: for example, when the advanced learners knew a baseword, they knew its derived form in 91% of the cases. Other results were that word family frequency but not derived word frequency determined knowledge of derived words, and that little support was found for Bauer and Nation’s (1993) hierarchy of affix difficulty. The main implication of the results is that the word family, which subsumes basewords and their related forms under word knowledge, is an appropriate unit of counting in L2 pedagogy and research for learners with extensive exposure to English and a Germanic first language.

Development and validation of the Yonsei Lifestyle Profile‐Satisfaction (YLP‐S) using the Rasch measurement model

AbstractBackgroundLifestyle also plays an important role in determining health and vitality among older adults. However, there is limited evidence about the lifestyle assessment. This study examined the psychometric properties of the Yonsei Lifestyle Profile‐Satisfaction (YLP‐S),MethodParticipants comprised community‐dwelling elderly from South. A confirmatory factor analysis (CFA) examined the unidimensionality assumption of the YLP‐S. Construct validity was tested by analyzing the item difficulty hierarchy, and item invariance was examined using differential item functioning (DIF) across sex and age. Participants comprised community‐dwelling elderly from South. A confirmatory factor analysis (CFA) examined the unidimensionality assumption of the YLP‐S. Construct validity was tested by analyzing the item difficulty hierarchy, and item invariance was examined using differential item functioning (DIF) across sex and age,ResultAmong 156 participants, 54 were males and 102 females. The CFA demonstrated that meaningful activity participation and nutrition subscales met the unidimensionality assumption. There was conceptual item difficulty hierarchy among the test items. The person strata values of the meaningful activity participation and nutrition were 5.37 and 1.33. Four items were showed showing DIF according to sex or age groups.ConclusionThe findings indicate that the YLP‐S demonstrated sound internal validity and it can be used for occupational therapists to measure multi‐faceted lifestyle of older adults.

On the Difficulty of Defining “Difficult” in Second-Language Vowel Acquisition

Hierarchies of difficulty in second-language (L2) phonology have long played a role in the postulation and evaluation of learning models. In L2 pronunciation teaching, hierarchies are assumed to be helpful in the development of instructional strategies based on anticipated areas of difficulty. This investigation addressed the practicality of defining a pedagogically useful hierarchy of difficulty for English tense and lax close vowels (/i I u ʊ/) produced by Cantonese speakers. Unlike their English counterparts, Cantonese close tense-lax pairs are allophonic variants with [i u] occurring before alveolars and [I ʊ] before velars. Each tense-lax pair represents a “phonemic split” in which members of a single L1 category are realized contrastively in L2. Despite evidence that English tense-lax distinctions are challenging for Cantonese speakers, no previous empirical work has closely considered the problem from the standpoint of vowel intelligibility across multiple phonetic contexts and in different words sharing the same rhyme. In a picture-based word-elicitation task, 18 Cantonese-speaking participants produced 31 high-frequency CV and CVC words. Vowels were evaluated for intelligibility by phonetically-trained judges. A series of mixed-effects binary logistic models were fitted to the scores, with vowel quality, phonetic context (rhyme) and word as factors, and length of Canadian residence and daily use of English as co-variates. As expected, the general hierarchy of difficulty for vowels that emerged (/i/ &amp;gt; /u/ &amp;gt; /ʊ/ &amp;gt; /I/) was complicated by large differences across phonetic contexts. Results were not readily explicable in terms of transfer; moreover, different words with the same rhyme were not produced with equal intelligibility. The most serious modeling complication was the sizeable inter-speaker variability in difficulties, which could not be accounted for by model co-variates. Although some difficulties were roughly systematic at the group level, it is argued that establishing a pedagogically useful hierarchy on such data would prove intractable. Rather, L2 learners might be better served by assessment and instructional targeting of their individual problem areas than by a focus on errors predicted from hierarchies of difficulty.