A Comparison the Information Function of the Item and Test of Numerical Aptitude Test using the Item Response Theory

The purpose of this study was to compare the item and test information function of numerical aptitude test using the item response theory of 1-, 2- and 3- model. There were two sample groups used in this study from the first year students of the Srinakharinwirot University in academic year 2015. The first group consisted of 2,424 social science area students took the numerical aptitude test A and the second group consisted of 2,031 scientific area students took the numerical aptitude test B. The numerical aptitude tests were 30 items with five alternatives which the part of selected testing to direct admission of Srinakharinwirot University. The data was analyzed by BILOG program. The result found that 1) the difficulty mean of the numerical aptitude test A was more difficult than those of test B 2) the item information function value in each test of the one- parameter logistic model is higher than values in the two- and three- parameter model and the values in the two- parameter model is lower values in the one- and three- parameter model