Rasch analysis of a Spanish language-screening parent survey.
A 59-item Spanish parent vocabulary list passed Rasch muster and is ready for front-line language screening.
01Research in Context
What this study did
Guiberson et al. (2014) ran Rasch analysis on a Spanish parent vocabulary survey. They started with 124 items and kept only the ones that fit the model.
The goal was to build a short, clean set of words that could screen preschool language in Spanish-speaking homes.
What they found
Fifty-nine vocabulary items passed the Rasch rules. The rest were too hard, too easy, or did not line up on one skill line.
The kept items left gaps at the very top and bottom of the ability range, showing where future items are needed.
How this fits with other research
M-Lunsky et al. (2011) did the same Rasch trimming on a Cantonese language scale. Both teams cut long pools down to tight, usable tools for preschool screening.
Wuang et al. (2010) also used Rasch to shorten the HVOT visual test for Chinese kids with Down syndrome. The method works across languages and skills.
Leung et al. (2014) saw high positive screen rates in Hispanic clinics using M-CHAT and ASQ. Mark’s shorter Spanish vocabulary set could lower false alarms by giving a cleaner language measure.
Why it matters
If you screen Spanish-speaking preschoolers, you now have a 59-word parent list that is psychometrically clean. Plug it into your intake packet to spot language delays faster and refer with confidence.
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02At a glance
03Original abstract
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.
Research in developmental disabilities, 2014 · doi:10.1016/j.ridd.2013.12.011