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]