Item difficulty and discrimination.
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A numerical matrix with 0s (wrong answer) and 1s (correct answer).
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.
R implementation and documentation: Michail Tsagris <email@example.com>
Kaplan E. L. and Meier P. (1958). Nonparametric estimation from incomplete observations. Journal of the American Statistical Association, 53(282): 457-481.
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