In this article we explore the testing of non-inferiority and equivalence hypotheses arising from multiple centers when the assumption of normality is violated. In a multicenter study, the trials are typically conducted at different centers which vary in terms of location, environment,...

This article examines the average cost function for property and casualty insurers. Cost function describes the relationship between a firm’s minimum production cost and outputs. The comparison of cost functions could shed light on the relative cost efficiency of individual firms, which is of...

Product offerings in many consumer packaged goods (CPG) categories come in a variety of complex branding structures built around some discernable branding hierarchy. We develop a nonparametric statistical method in the context of a market response model to estimate the residual equity of each...