create_prob_array {cat.dt} R Documentation

## Multidimensional array of response probabilities

### Description

For every item (dim 1) in an item bank and every evaluated ability level (dim 2), computes the probability of picking every possible response (dim 3) given the ability level

### Usage

create_prob_array(model, bank, nres)


### Arguments

 model polytomous IRT model. Options: "GRM" for Graded Response Model and "NRM" for Nominal Response Model bank matrix of the item bank. Rows represent items, and columns represent parameters. If the model is "GRM", the first column represents the alpha parameters and the next columns represent the beta parameters. If the model is "NRM", odd columns represent the alpha parameters and even columns represent beta parameters nres vector of number of possible responses for every item

### Value

A 3-dimensional array of probability responses