align_x_j: Align x_j with the priors

In spdesign: Designing Stated Preference Experiments

Align x_j with the priors

Description

Renames the columns of x_j from terms to parameters, so that a generic parameter is a single column even if its attribute has a different name in each alternative. Parameters that do not enter the utility function of an alternative are zero for that alternative. The columns are ordered as the priors, which ensures that the variance-covariance matrix derived by derive_vcov matches the priors.

Usage

align_x_j(x_j, terms, names_priors)

Arguments

x_j	A list of model matrices returned by define_x_j
terms	A list of terms and their parameters returned by pair_param_terms
names_priors	The names of the priors

Value

The list x_j with one column per prior in the order of the priors

spdesign documentation built on Oct. 6, 2026, 9:07 a.m.