tcc {lordif} | R Documentation |
computes a test characteristic curve (tcc) from input item parameters
tcc(a, cb, theta)
a |
a vector of slope parameters |
cb |
a matrix of category boundary/threshold parameters |
theta |
a grid of theta values |
The graded response model is assumed. The lowest score for each item is set to 0 not 1. length(a) must be the same as nrow(cb)
Retruns a vector representing a tcc
Seung W. Choi <s-choi@northwestern.edu>
Samejima, F. (1969). Estimation of latent ability using a response pattern of graded scores. Psychometrika Monograph, 17.
## ## Not run: tcc(a,cb,theta)