Returns a probabilistic item response, given one ability and one
set of item parameters.
Usage
itemResp(myAblty, myItem)
Value
A numeric score, usually an integer in the range
0, 1, 2, ..., k-1. This is taken from the first column of the matrix of
item parameters so may also contain a numeric score.
Arguments
myAblty
A numeric ability.
myItem
A single item (a matrix k categories by four
(category score, delta dot, tau, discrimination).