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

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