probab_GRM {cat.dt} R Documentation

## Item response GRM probabilities

### Description

Computes the probabilities of picking every possible response of an specified item from the item bank for all evaluated ability levels using the Graded Response Model

### Usage

probab_GRM(item_par, nres)


### Arguments

 item_par vector containing the item parameters. First component is the alpha parameter and the next are the beta parameters nres number of possible item responses

### Value

A matrix of response probabilities. Rows represent evaluated ability levels and columns represent responses