Brezger, Andreas and Steiner, Winfried J Monotonic regression based on bayesian P-Splines: an application to estimating price response functions from store-level scanner data 2008 - 2008 - 90-104 V. 26 Issue. 1 Subjects--Topical Terms: Business & Economic Statistics Subjects--Index Terms: Asymmetric quality tier competition;Generalized additive model;