MixedLogit.prepare_X_matrix

MixedLogit.prepare_X_matrix(df, utility_formulas, depvar)

Prepare the design matrices for the utility equations.

Creates: - X: Alternative-specific covariates (N x J x K) - F: Fixed covariates (N x K_fixed) or None - List of alternative names - Array of unique fixed covariate names - List of random covariate names

Returns:

tuple

(X, F, alternatives, fixed_covar_names, random_covar_names)