min2LL_4pno: Compute 4PNO Deviance
Description
Internal function to -2LL
Usage
min2LL_4pno(N, J, Y, as, bs, gs, ss, theta)
Arguments
N
An int, which gives the number of observations. (> 0)
J
An int, which gives the number of items. (> 0)
Y
A N by J matrix of item responses.
as
A vector of item discrimination parameters.
bs
A vector of item threshold parameters.
gs
A vector of item lower asymptote parameters.
ss
A vector of item upper asymptote parameters.
theta
A vector of prior thetas.