This workshop introduces methods of analyzing interactions (moderated effects) in regression models:  calculating, comparing and graphing simple effects and slopes.  Specifically, we emphasize the use of proc plm and the lsmeans and estimates statements in SAS in conjunction with a solid understanding of the regression equation.  Examples include two- and three-way interactions in linear regression and two-way interactions in logistic regression.  Although the concepts of moderation and interaction are reviewed in the seminar, some background in regression and moderation is recommended.