Plot residual principal-component loadings — plot_pca • rasch

Residual-component loadings against item location. Opposing clusters suggest a further dimension. Any returned component may be plotted.

Usage

plot_pca(fit, component = 1)

Arguments

fit: A fitted object from rasch.
component: Which residual principal component to plot (default the first component).

Value

Called for its plotting side effect; invisibly NULL.

Examples

set.seed(1)
d <- seq(-2, 2, length.out = 6)
X <- matrix(rbinom(400 * 6, 1, plogis(outer(rnorm(400), d, "-"))), 400, 6)
colnames(X) <- paste0("I", 1:6)
plot_pca(rasch(X))