tcc {lordif}R Documentation

computes a test characteristic curve (tcc)

Description

computes a test characteristic curve (tcc) from input item parameters

Usage

tcc(a, cb, theta)

Arguments

a a vector of slope parameters
cb a matrix of category boundary/threshold parameters
theta a grid of theta values

Details

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)

Value

Retruns a vector representing a tcc

Author(s)

Seung W. Choi <s-choi@northwestern.edu>

References

Samejima, F. (1969). Estimation of latent ability using a response pattern of graded scores. Psychometrika Monograph, 17.

See Also

equate, probgrm

Examples

##
## Not run: tcc(a,cb,theta)

[Package lordif version 0.1-4 Index]