Then with zero shock term the value of the dependent variable is δ1+ αXi for the base category unmarried males, δ1 + δ4+ αXi for unmarried females, δ1 + δ5+ αXi for married males, and δ1 + δ6+ αXi for married females. This specification involves the same number of right-side variables as does the previous specification with an interaction term, and the regression results for the predicted value of the dependent variable contingent on Xi, for any combination of qualitative traits, are identical between this specification and the interaction specification.