itemInfoOverTheta {conquestr}R Documentation

itemInfoOverTheta

Description

Calculates item information over a rage of theta given a set of item parameters. Returns a data frame with item information at a discrete set of values of theta - useful for plotting item information functions.

Usage

itemInfoOverTheta(myItem, minTheta = -6, maxTheta = 6, stepTheta = 0.1)

Arguments

myItem

A matrix of item parameters of the structure used in 'simplef'

minTheta

The smallest value of ability PDF to plot.

maxTheta

The largest value of ability PDF to plot.

stepTheta

The increment to iterate over the ability PDF. Defaults to 0.01.

Examples

anItem<-  matrix(c(0,0,0,1,1,0), nrow = 2, byrow = TRUE)
itemInfoOverTheta(anItem)

[Package conquestr version 0.9.96 Index]