Differential item performance in psychological tests, its sources and interpretation

Abstract

We turn in this article the role of differential performance of the item in the
psychological tests as a concept of the newly emerged in the dictionary of
psychological measurement and tests, and clarify the sources of falling in the bias of
the items and the negative impact on the interpretation of the results of the various
psychological tests including various resolutions, and consequently become testing
not valid and the possibility to be biased and this is what threatens the sincerity of the
reasoning of the dislocation and reduces the confidence and precision in the
interpretations implications. To deal with this subject the researchers developed some
statistical methods for the detection of the characteristics of the performance of the
test items and whether different individuals belong to certain groups, which became
known as the differential performance of the item, which is of modern methods of
analysis of the items of the test and important evidence of the sincerity of inferred
from test grades .