| http://www.w3.org/ns/prov#value | - Joint Pricing-Promotion Model A generalization of the two models above is a comprehensive joint multivariate regression model having the formal structure U=G??+XB+P??+E (10) where U is the vector of log-demands for a given category of products, G is the common factors design matrix (containing the common sales conditions), ?? is the common factors regression coefficient matrix (or common effects m
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