Item difficulty and discrimination
Item difficulty and discrimination.
diffic(x) discrim(x, frac = 1/3)
x |
A numerical matrix with 0s (wrong answer) and 1s (correct answer). |
frac |
A number between 0 and 1 used to calculate the difficulty of each question. |
The difficulty and the discrimination of each question (item) are calculated.
A vector with the item difficulties or item discriminations.
Michail Tsagris
R implementation and documentation: Michail Tsagris <mtsagris@uoc.gr>
Kaplan E. L. and Meier P. (1958). Nonparametric estimation from incomplete observations. Journal of the American Statistical Association, 53(282): 457-481.
x <- matrix(rbinom(100 * 10, 1, 0.7), ncol = 10) diffic(x) discrim(x)
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