PISA – Μαθηματικά: Πόσο Αξιόπιστα Είναι τα Αποτελέσματα;

Abstract

The aim of this study was to investigate the degree of reliability of the results of the PISA 2009 mathematics test. For the purposes of this study the mathematics results of the 2009 program were downloaded and analysed with the use of the Rasch Partial Credit Model. Analyses indicated that (a) reliability indices were very low, (b) the validity of a large proportion of students responses was questionable and (c) there was evidence of item bias in many items, against almost all countries. These results lead to the conclusion that the degree of reliability of the PISA mathematics exams is low.