tcc | R Documentation |
computes a test characteristic curve (tcc) from input item parameters
tcc(a, cb, theta, model = "GRM")
a |
a vector of slope parameters |
cb |
a matrix of category boundary/threshold parameters |
theta |
a grid of theta values |
model |
IRT model, either "GRM" or "GPCM" |
Either the graded response model (GRM) or the generalized partial credit model (GPCM) can be specified. The lowest response/score for each item is coded as 0 not 1.
Retruns a vector of tcc values over a theta grid
Seung W. Choi <choi.phd@gmail.com>
probgrm
, probgpcm
## Not run: tcc(a,cb,theta,model="GRM")
## Not run: tcc(a,cb,theta,model="GPCM")
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