In Derzon v. Appleton Papers, Inc., No. 96-CV-3678, 1998 WL 1031504, at 1 (Wis. Cir. Ct. July 7, 1998), a proposed class of indirect purchasers of fax paper was not certified in a case brought under Wisconsin's antitrust and deceptive trade practices acts. Plaintiff had represented that by means of incidence analysis and regression analysis, an expert would prove damages by common evidence. Id. at 7.