osm_Xstar: Function to calculate the negative structure vector matrix X*...

In divoRce: Diagnosing Separation Phenomena in Categorical Response Models

Function to calculate the negative structure vector matrix X* for an ordered stereotype model.

Description

Function to calculate the negative structure vector matrix X* for an ordered stereotype model.

Usage

osm_Xstar(y, X, label = TRUE, rational = FALSE)

Arguments

y	an ordinal outcome variable. Should be an ordered factor else we order increasingly in an alpha-numeric fashion.
X	a design matrix, e.g. generated via a call to 'model.matrix'. This means we expect that X already contains the desired contrasts for factors (e.g., dummies) and any other expanded columns (e.g., for polynomials).
label	should the structure vector matrix have row and column labels?
rational	should the structure vectors been given in rational format?

Details

If X is given as the standard R object for design matrices (i.e., a numeric matrix) or as a data frame, they are returned the same way unless rational=TRUE; then it is returned as a character matrix of rational numbers. If X is given in rational format, it is also returned as rational format even if rational is set to FALSE. OSM checks do not need to consider the reference category.

Value

a matrix of negative structure vectors with or without labels

divoRce documentation built on April 28, 2026, 3:01 a.m.