Three Parameter IRT Model Derived Probabilities

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Description

Calculate vector of probabilities of success from person and item parameters under the 3pl IRT model.

Usage

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  thpl(theta=NULL,beta=NULL,alpha=NULL,eta=NULL)

Arguments

theta

Vector of theta parameters

beta

Vector of beta parameters

alpha

Vector of alpha parameters

eta

Vector of eta parameters

Details

Three Parameter IRT Model Derived Probabilities

Value

Vector of probabilities of success, persons in columns, items in rows

Examples

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theta <- c(-2:2)
beta <- rep(0,5)
alpha <- rep(1,5)
eta <- seq(from=0.2,by=0.2,to=1)
thpl(theta,beta,alpha,eta)