Description Usage Arguments Value Author(s) References
Calculates the item success probability under the 4PL model.
1 | Calculate4plProb(thetaValue, itemParameters, logistic = TRUE)
|
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, item difficulties on the second, item guessing parameters on the third, and item upper asymptote on the fourth |
logistic |
A logical value stating if the IRT model will use the logistic or the normal metric. |
probabilities A numeric matrix with the probabilities on each thetaValue for each item.
Victor H. Cervantes <vhcervantesb at unal.edu.co>
de Ayala, R. J., (2009). The theory and practice of item response theory. New York: The Guildford Press
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