probgpcm | R Documentation |
Calculates a matrix of item response probabilities over a grid of theta values for an item
probgpcm(theta, a, cb)
theta |
a vector of theta values (e.g., quadrature points) |
a |
a slope parameter value |
cb |
a vector of category threshold values |
The Generalized Partial Credit Model (Muraki, 1992) is assumed.
Returns a matrix of item response probabilities. The first dimension corresponds to the length of theta.
Seung W. Choi <choi.phd@gmail.com>
Muraki, E. (1992). A generalized partial credit model: Application of an EM algorithm. Applied Psychological Measurement, 16, 159-176.
calcprob
, probgrm
probgrm(seq(-4,4,.1), 1.5, c(-1.2,0.5,1.5))
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