Parent ratings of the ADHD items of the disruptive behavior rating scale: Analyses of their IRT properties based on the generalized partial credit model
Section snippets
Participants
The participants were Australian parents of 783 children. All participants were from the State of Victoria, Australia. In all, 55% of the sample resided in metropolitan Melbourne, 42% resided in regional areas (e.g., Geelong), and 3% resided in rural areas (e.g., Horsham). The parents provided ratings for 403 boys and 380 girls. The children were from fourteen randomly selected schools. All children were between 6 and 11 years of age. The mean age (SD) for boys was 8.88 (1.96) years, and this
Testing for IRT assumptions
The results of the PA analyses for unidimensionality for the IA and HI scales for ratings of boys and girls are presented in Table 1. As shown, in all cases, the PA indicated only one component, and the ratios of the eigenvalues of the first and second factors were high. These findings support the unidimensionality of the IA scale and HI scale for boys and for girls.
In relation to the 1-factor CFA models for IA scale and HI scale for boys and for girls, the RMSEA and CFI values, shown in Table 2
Discussion
The aim of this study was to use GPCM to evaluate the IRT properties and invariance of parent ratings of the DBRS for boys and girls. It needs to be stressed at the outset that the results for the analyses for the IA and HI scales for boys and girls are not directly comparable. In IRT, the responses to the items are used to obtain continuous scaled estimates of the underlying trait, called theta (θ). In most computer programs, the trait value is set at a mean of zero and a standard deviation of
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