dicrfGn {lazy.irt}R Documentation

Calculation of the Derivative of Item Response Function of Graded Response Items with Normal Ogive MOdel

Description

Calculation of the Derivative of Item Response Function of Graded Response Items with Normal Ogive MOdel

Usage

dicrfGn(param, theta, smallP = smallP, print = 0, plot = 0, debug = 0)

Arguments

param

Item Parameter Data Frame

theta

Discrete theta values

smallP

Minimum value of probability

print

= 1 to print result

plot

= 1 to plot result

debug

= 1 to print intemediate result

Value

A list of
dP length(theta) x sum(ncat) dICRF matrix
dPP length(theta) x sum(ncat) dICBRF matrix
dPt length(theta) x nitems derivative of item response function
fromP, toP indexes of each ICRF in P
fromPP, toPP indexes of each ICBRF in PP


[Package lazy.irt version 0.1.3 Index]