A clustered-item dataset with scores of 210 children (measurement taken at a first time point of a larger developmental study; Brinchmann et al., 2019) that took the Norwegian adaptation of the Test for Reception of Grammar (TROG; Bishop, 1979). The TROG consists of C=20 clusters of Jc=4 dichotomously scored items for all c. and all kids were administered each of the J=80 items. This item set is used as a real data example to demonstrate how to investigate the ordering structure of a test in Koopman & Braeken (2024).
data(autonomySupport)A 210 by 80 data frame containing dichotomous data. Each column reflects an item, each row a respondent.
The column labels reflect the cluster (letters) and item within the cluster (numbers). For example,
item a1 is the first item in cluster a, see colnames(trog).
Each item is dichotomously scored, where 1 reflects a correct response and 0 an incorrect response.
Bishop, D. V. M. (1979). Comprehension in developmental language disorders. Developmental Medicine & Child Neurology, 21(2), 225-238. tools:::Rd_expr_doi("10.1111/j.1469-8749.1979.tb01605.x").
Brinchmann, E. I., Braeken, J., & Lyster, S.-A. H. (2019). Is there a direct relation between the development of vocabulary and grammar? Developmental Science, 22(1), 1-13. tools:::Rd_expr_doi("10.1111/desc.12709").
Koopman, L. & Braeken, J. (2024). Investigating the Ordering Structure of Clustered Items Using Nonparametric Item Response Theory. Manuscript submitted for publication.
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