Generates a matrix containing the true (latent) skill per administration for a given group of examinees.
genTrueSkills(I, num.forms, mu.skill = rep(0, num.forms),
sd.skill = rep(1, num.forms))
number of test takers per form. It can have length 1, so all forms will have the same number of test takers, or be a larger vector with the respective number of examinees on each form
number of test forms
mean skill per form
standard deviation of skills per form
List of examinee skill per form