dicrfBn {lazy.irt}

R Documentation

Calculation of the Derivative of Item Response Function of Binary Normal CDF Items

Description

Calculation of the Derivative of Item Response Function of Binary Normal CDF Items

Usage

dicrfBn(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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