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Meinck, Sabine; Cortes, Diego; Tieck, Sabine – Large-scale Assessments in Education, 2017
Survey participation rates can have a direct impact on the validity of the data collected since nonresponse always holds the risk of bias. Therefore, the International Association for the Evaluation of Educational Achievement (IEA) has set very high standards for minimum survey participation rates. Nonresponse in IEA studies varies between studies…
Descriptors: Response Rates (Questionnaires), Bias, Educational Assessment, Questionnaires
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Oliveri, Maria Elena; Ercikan, Kadriye; Zumbo, Bruno – International Journal of Testing, 2013
In this study, we investigated differential item functioning (DIF) and its sources using a latent class (LC) modeling approach. Potential sources of LC DIF related to instruction and teacher-related variables were investigated using substantive and three statistical approaches: descriptive discriminant function, multinomial logistic regression,…
Descriptors: Test Bias, Test Items, Multivariate Analysis, Discriminant Analysis