Investigating Estimations of Item, Ability and Information Function Parameters of the Intellectual Abilities Test using the Three Parametric Logistic Model

Abstract

The present study aimed to estimating item, ability and information function parameters of the intellectual abilities test using the three parametric logistic model. To achieve this goal, the intellectual abilities test was administered on a sample consisted of (1250) 6th. Graders at Amman, the test is consisted of three sub-scales: the analytical bility (42) items, the creative ability (35) item, and the practical ability (25) items, then data fit to the 3PLM was investigated. The results showed that the means of difficulty, discrimination, guessing parameters, information function, MNSQ, and ZSTD are: for the analytical bility

(-0.00048، 0.98، 0.04، 0.4، 0.997، 0.041), for the creative ability (-0.001629، 1.0029، 0.034 0.54، 0.995، -2.193), and for and the practical ability (0.046، 1.003، 0.019، 1.52، 0.992، -0.371). the means of ability parameters were for the three sub-scales (0.4, 0.32, -0.2)