Resumen de Item Response Theory for Longitudinal Data: Item and Population Ability Parameters Estimation

Heliton R. Tavares, Dalton Francisco de Andrade

• In this paper we deal with the problem of estimating item and population ability parameters in longitudinal studies where a group of individuals is submitted to different tests along the time, with some common items. Several covariance structures are explored to model the possible dependency between the abilities of the same individual, measured at different instants. Maximum likelihood equations and some simulation results are presented.