which function to use to estimate individual ability can an individual model parameters be calculated using the IRT how to calculate the ability of an integer model how do i estimate my ability using irt function that estimates individual ability what model parameters are used to determine ability what is the function to estimate individual ability from model parameters which is best to estimate the ability of an item with the model parameters known? how to determine ability using itrt how to find individual ability using irt how to estimate ability with itrt what is factor.score how to calculate ability using irt how to estimate individual ability how does itt calculate ability how to estimate individual ability of a test how to estimate ability from model parameters what is the function for estimating an individual ability what parameters can be used in an irt test what is the function of irt for estimating ability