“…Regression methods were soon enhanced by three developments: (1) multivariate statistics such as factor analysis (Cremer, 1974), which has more recently been updated by singular value decomposition methods (Ansari, 2013), and cluster analysis (Cremer, 1974;David Shepard Associates, 1999), (2) probability models (Bayus, 1993;Rao and Steckel, 1995), and (3) a series of advanced econometric models. Factor analysis and cluster analysis often worked hand in hand to provide orthogonal regressors for regression models (Cremer, 1974) or segmentation schemes within which analysts could run separate regression models.…”