dicrfP {lazy.irt} | R Documentation |
Calculation of the Derivative of Item Response Function of Partial Credit Items
dicrfP(paramP, theta, DinP = 1, smallP = 0, print = 0, plot = 0, debug = 0)
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 |
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