Calculates the item success probability under the 2PL model.

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Description

Calculates the item success probability under the 2PL model.

Usage

1
Calculate2plProb(thetaValue, itemParameters, logistic = TRUE)

Arguments

thetaValue

A numeric value or array for the theta (ability) value(s) where the difference will be calculated

itemParameters

A matrix containing the numeric values of item discriminations on the first column and item difficulties on the second

logistic

A logical value stating if the IRT model will use the logistic or the normal metric.

Value

probabilities A numeric matrix with the probabilities on each thetaValue for each item.

Author(s)

Victor H. Cervantes <vcervantes at icfes.gov.co> <vhcervantesb at unal.edu.co>

References

de Ayala, R. J., (2009). The theory and practice of item response theory. New York: The Guildford Press

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