Internal constructor for projoint_qoi objects.
A projoint_qoi stores the specification of custom
quantities of interest (QOIs) for conjoint estimation.
Typically called by set_qoi rather than directly.
Internal constructor for projoint_qoi objects.
A projoint_qoi stores the specification of custom
quantities of interest (QOIs) for conjoint estimation.
Typically called by set_qoi rather than directly.