Calculate item probability of correct response for NCRUM parameterization

Description

Calculates the probability of a correct response for an item given an NCRUM parameterization

Usage

1
GetProbCorrectNcrum(pi.i.star.prime, r.ia.star, q.ia, alphas)

Arguments

pi.i.star.prime

a numeric value for the probability of a correct response for item i given that no attributes have been mastered.

r.ia.star

a numeric 1 x nattributes vector of the penalty probabilities for this item of a correct response for each required attribute that has not been mastered.

q.ia

a numeric 1 x nattributes vector of the qmatrix entries for the given item.

alphas

a numeric 1 x nattributes vector with a 1 if a student has mastered an attribute and 0 otherwise.

Value

the numeric value representing the probability of a correct response for the ith item.

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