dicrfP {lazy.irt}R Documentation

Calculation of the Derivative of Item Response Function of Partial Credit Items

Description

Calculation of the Derivative of Item Response Function of Partial Credit Items

Usage

dicrfP(paramP, theta, DinP = 1, smallP = 0, print = 0, plot = 0,
  debug = 0)

Arguments

paramP

Item Parameter Data Frame of Partial Credit Items

theta

Discrete theta values

DinP

= 1 to include D=1.7 in logistic function

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
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]