Guttman-ordered response matrix and reproducibility

Orders persons by location (descending) and items by location (ascending), the Guttman scalogram arrangement, and computes the coefficient of reproducibility against the deterministic Guttman pattern implied by each person's total score.

Usage

guttman_table(fit)

Arguments

fit

A fitted object from rasch.

Value

A list with the ordered score matrix matrix (persons by items, row and column names carrying the ID and item labels), the person and item orderings, and the coefficient of reproducibility CR.

Examples

set.seed(1)
d <- seq(-2, 2, length.out = 6)
X <- matrix(rbinom(200 * 6, 1, plogis(outer(rnorm(200), d, "-"))), 200, 6)
colnames(X) <- paste0("I", 1:6)
guttman_table(rasch(X))$CR
#> [1] 0.8116667