ITEM ANALYSIS IN CLASSICAL TEST THEORY USING MS EXCEL AND IATA SOFTWARES

The work has briefly overviewed the concepts and the meaning of measurements of the Classical Test Theory (CTT) and the relationships between statistical values such as mean, medium, variance, standard deviation with corresponding values in item analysis such as item difficulty, item discrimination, test reliability, point-biserial coefficient, respectively. To evaluate algorithm and to obtain the accuracy of IATA software, the numerical values of measurements computed in IATA has been compared with corresponding ones calculated in MS Excel using original formulae of the Classical Test Theory.