dicrfB {lazy.irt}

R Documentation

Calculation of the Derivative of Item Response Function of Binary Logistic Items

Description

Calculation of the Derivative of Item Response Function of Binary Logistic Items

Usage

dicrfB(param, theta, maxZ = 700, zero = 0, smallP = 0, print = 0, plot = 0)

Arguments

param	Item Parameter Data Frame
theta	Discrete theta values
maxZ	Maximum value of the argument to logistic function
zero	= 0 to exclude the xzero-th category from output
smallP	Minimum value of probability
print	= 1 to print result
plot	= 1 to plot result

Value

dP length(theta) x nitems dICRF matrix when zero=0
length(theta) x 2*nitems dICRF matrix when zero=1

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