rpf.rescale function

Rescale item parameters

Adjust item parameters for changes in mean and covariance of the latent distribution.

rpf.rescale(m, param, mean, cov)

Arguments

• m: item model
• param: item parameters
• mean: vector of means
• cov: covariance matrix

Examples

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