var,Itempool-method {irt}

Calculate the variances of items in an Itempool

Description

var Returns the variance of each item of an Itempool-class object for a given ability or abilities, i.e. \theta.

Usage

## S4 method for signature 'Itempool'
var(x, y = NULL, na.rm = FALSE, use)

Arguments

x

An Itempool-class object containing the item parameters.

y

A numeric vector containing the ability parameters (i.e. theta).

na.rm

Ignored for var(Itempool, ...)

use

Ignored for var(Itempool, ...)

Value

Item variances at given theta will be returned.

Author(s)

Emre Gonulates