Abstract
The Short Tests of Linguistic Skills was developed by the Chicago Board of Education to help teachers detemine language dominance of Spanish bilingual children aged 8-13. A latent trait model, the Rasch model, has been used to single out items that do not fit the construct of fluency in English or fluency in Spanish. After removing the defective items the English and Spanish subtests have been calibrated. Conversion tables are provided in the appendix for users of this particular test. The technique is applicable to any other test, and its effectiveness is evidenced in its singling out some defective items that remained undetected through traditional item analysis when the test was first published. Ability scores produced by this technique should be more refined and discriminating. The tables will be useful to those who are currently using this test or intend to use it in the future for establishing language dominance of Spanish-English bilingual students.
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