IIF2PLM {exametrika}R Documentation

IIF for 2PLM

Description

Item Information Function for 2PLM

Usage

IIF2PLM(a, b, theta)

Arguments

a

slope parameter

b

location parameter

theta

ability parameter

Value

Returns a numeric vector representing the item information at each ability level theta. The information is calculated as: I(\theta) = a^2P(\theta)(1-P(\theta))


[Package exametrika version 1.1.0 Index]