Do They Rate in the Same Way?
Testing of Measurement Invariance Across Parent and Teacher SDQ Ratings
Abstract
Abstract. The internal structure of the Strengths and Difficulties Questionnaire (SDQ) has been widely discussed in the literature. The first purpose of this study was, therefore, to analyze the internal structure of the SDQ as completed by German parents and teachers. Parents and teachers of 1,135 children between the ages of 3 and 6 years in German daycare facilities were asked to complete the SDQ. Using confirmatory factor analysis (CFA), we found that the original five-factor model with added correlations between items with similar content and allowing cross-loads of reverse-worded items to the prosocial behavior factor is the model that fits the data the best. Additionally, we found significant mean differences between parents and teachers in four of the five SDQ subscales. Nevertheless, to compare the scores across both groups, it is necessary that the SDQ measures social-emotional and behavioral difficulties for both parents and teachers in the same way. Hence, the second purpose of this study was to test for measurement invariance of the SDQ across both groups. Using multigroup confirmatory factor analysis (MGCFA), we found that strict measurement invariance is tenable. Therefore, the observed means of the SDQ scores from parents and teachers are readily comparable and interpretable.
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