Rescale item parameters
Adjust item parameters for changes in mean and covariance of the latent distribution.
rpf.rescale(m, param, mean, cov)
m |
item model |
param |
item parameters |
mean |
vector of means |
cov |
covariance matrix |
spec <- rpf.grm() p1 <- rpf.rparam(spec) testPoint <- rnorm(1) move <- rnorm(1) cov <- as.matrix(rlnorm(1)) Icov <- solve(cov) padj <- rpf.rescale(spec, p1, move, cov) pr1 <- rpf.prob(spec, padj, (testPoint-move) %*% Icov) pr2 <- rpf.prob(spec, p1, testPoint) abs(pr1 - pr2) < 1e9
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