Abstract
The study focused on the determination of the psychometric properties and Standardization of Reynolds Adaptable Intelligence Test (RAIT-NV) using Item Response Theories in Nigeria. The study used the triangulation research design. Five research questions guided the study. A sample of 2120 students was randomly drawn using multistage sampling techniques from a population of 14,107,456 of all the undergraduate, secondary and upper primary students in Nigeria. The instrument for the data collection is Reynolds Adaptable Intelligence Test (RAIT-NV). RAIT-NV reliability coefficient was 0.92 using Cronbach Alpha and the construct validity was 0.88. To answer the five research questions, data generated were analyzed using The X-Calibre 4.2, EIRT, SPSS, Microsoft excel, data was also analyzed using the IRT logistic model (2PLM), TIF, Factor analyses, Correlations, Analysis of variance, (ANOVA) z-score, T-score, normalized standard score and percentile ranks. Result showed that, under the IRT framework that RAIT-NV item difficulty graduates from very easy to very difficult, RAIT-NV items were able to discriminate between examinee high and those low on the trait been measured. RAIT-NV had satisfactory factor structure and had local independent, TIF was satisfactory. Percentile ranks, z scores, T scores, and Normalized standard score of RAIT-NV were established. The finding of the study showed that using IRT in revalidation and standardization of instrument provide reliable and valid instrument for measuring intelligence. Based on the findings, it was recommended among others that Teachers, test developers, psychologist, researchers and relevant educational agencies, should ensure that they establish the Z scores, T scores, Percentile rank and Normalized standard score of any instrument they are revalidating and standardizing for measuring intelligence. This is recommended to even out all the difference from age, gender, ethnicity and educational level associated with raw scores. Citation: Magnus-Arewa Eseose Anthonia and G. W. Orluwene (2021) Determination of the Psychometric Properties and Standardization of Reynolds Adaptable Intelligence Tests-Nonverbal (Rait-Nv) Using Item Response Theory in Nigeria, International Journal of Education, Learning and DevelopmentVol. 9, No.6, pp.57-77
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