TestInformationFunc {exametrika}R Documentation

TIF for IRT

Description

Test Information Function for 4PLM

Usage

TestInformationFunc(params, theta)

Arguments

params

parameter matrix

theta

ability parameter

Value

Returns a numeric vector representing the test information at each ability level theta. The test information is the sum of item information functions for all items in the test: I_{test}(\theta) = \sum_{j=1}^n I_j(\theta)


[Package exametrika version 1.5.1 Index]