Capturing flexible correlations in multiple-discrete choice outcomes using copulas

摘要

This paper aims to examine three purchase patterns which frequently occur in multiple-discrete choice situations: joint-purchase, quantity-preference, and quantity-concordance. First, "joint-purchase" refers to the tendency that two products are either purchased together or separately. Second, "quantity-preference" refers to the tendency to purchase a product in preferred amounts. Third, "quantity-concordance" refers to the tendency that purchase quantities of two products are either concordant or discordant. These patterns are mainly attributed to unobserved factors such as economic reasons, habits, time pressure, mood, and/or physical environment. No study has fully incorporated the three purchase patterns simultaneously. In this study, we develop a unified copula-based approach which can incorporate all the three purchase patterns simultaneously.