Rasch analysis of a Spanish language-screening parent survey.

The purpose of this study was to evaluate and refine items from a parent survey designed to screen the language skills of Spanish-speaking preschoolers. This investigation applied Rasch modeling to systematically evaluate and identify items that demonstrated favorable qualities. A set of 124 parent survey items was administered to 107 Spanish-speaking parents of preschool age children. Parents completed survey items intended to provide a global measure of preschool language abilities. Rasch analyses of the survey items were conducted using WINSTEPS. Results indicated that 59 items, all vocabulary items, fit the Rasch model. Sufficient unidimensionality was obtained, with the model accounting for 58% of the variance. Item difficulty estimates ranged from -7.43 to 4.12, with a shortage of items at both the lower ability level and at the higher ability level. Analyses of pruned and remaining items identified the type of items that may be most useful for a refined item bank. These results will inform the development of new items for a Spanish language-screening parent survey for preschool age children.