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

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