| CrossedProbabilities {DFIT} | R Documentation |
Calculates the crossed probabilities associated with the numerator and denominator of the odds-ratio under dichotomous IRT models
Description
Calculates the crossed probabilities associated with the numerator and denominator of the odds-ratio under dichotomous IRT models
Usage
CrossedProbabilities(thetaValue, itemParameters, logistic, irtModel = "3pl")
Arguments
thetaValue |
A numeric value or array for the theta (ability) value(s) for which the odds will be calculated |
itemParameters |
A list containing the "focal" and "reference" item parameters. Item parameters are assumed to be on the same scale. |
logistic |
A logical indicating whether the logistic or the normal metric should be used. |
irtModel |
A string stating the irtModel used. May be one of "1pl", "2pl", or "3pl". |
Value
out A list containing the crossed products for the 'num' the numerator, 'den' the denominator for the odds-ratio, and 'or' the odds-ratio
Author(s)
Victor H. Cervantes <vhcervantesb at unal.edu.co>
References
Roussos, L., Schnipke, D. & Pashley, P. (1999). A generalized formula for the Mantel-Haenszel Differential Item Functioning parameter. Journal of educational and behavioral statistics, 24(3), 293–322. doi:10.3102/10769986024003293