Bohn, M., Prein, J., Engicht, J., Haun, D., Gagarina, N., & Koch, T. (2025). PREVIC: An adaptive parent report measure of expressive vocabulary in children between 3 and 8 years of age. Behavior Research Methods, 57(3), 95. https://doi.org/10.3758/s13428-025-02615-4
Link to task (in German): PREVIC
Here, we present the PREVIC (Parent Report of Expressive Vocabulary in Children), an open-access, high-quality vocabulary checklist for German-speaking children between 3 and 8 years of age. The PREVIC was constructed leveraging the advan- tages of item response theory: we designed a large initial item pool of 379 words and collected data from 1190 caregivers of children between 3 and 8 years of age. Based on these data, we computed a range of fit indices for each item (word) and used an automated item selection algorithm to compile a final pool that contains items that (a) vary in difficulty and (b) fit the Rasch (one-parameter logistic) model. The resulting task is highly reliable and shows convergent validity. The IRT-based construction allowed us to design an adaptive version of the task that substantially reduces the task duration while retaining measurement precision. The PREVIC fills an important gap in the toolkit of researchers interested in language development and provides an ideal starting point for developing converging measures in other languages.
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├── adaptivetesting <-- scripts for maximum likelihood estimations
├── public
├── data <-- scripts for uploading data to server
├── images <-- logos etc.
├── all html pages <-- index, instructions, questionnaire and goodbye page
├── src <-- folder containing all CSS and JavaScript for functionality
└── ...some more config files
Development requires Node.js
git clone [email protected]:ccp-eva/orev-demo.gitnpm installnpm start
git clone [email protected]:ccp-eva/orev-demo.gitnpm installnpm run build- Upload the contents within the
distfolder to your web hoster.