INVESTİGATİON OF ITEMS İN PISA 2009 STUDENT QUESTİONNAİRE SUBSCALES (Q32-Q33) İN TERMS OF DİFFERENTİAL ITEM FUNCTİONİNG

This study was aimed to assess items of PISA-2009 student questionnaire’s subscales of “sense of school learnings” and “sense of teachers” in terms of differential item functioning by using gender and 4 different country data comperatively. For the DIF analysis, likelihood ratio test was preferred in graded response theory based on item response theory (IRT) because of polytomously scored items. Confirmatory factor analysis (CFA) was used for data sets saperately to test the unidimensionality assumption of IRT. CFA analysis showed that unifactorial construct of subtests was confirmed and unidimensionality assumption of IRT was met. DIF analysis were carried out by MULTILOG software and 2 items for gender, 1 item for Ireland-GBR sample, 2 items for USA-GBR sample and 4 items for Turkey-USA sample was flagged as DIF in the subscale of “sense of school learnings”. In the subscale of “sense of teachers”, 1 item for gender, 1 item for Ireland-GBR sample, 2 items for USA-GBR sample and4 items for USA-Turkey sample were flagged as DIF.