Did I Get This – Role-Type Classification
In each of the following three problems, you are presented with a brief description of a study involving two variables. Based on the role-type classification of the two variables, you’ll be asked to determine which of the four cases represents the data structure of the problem.
http://phhp-faculty-cantrell.sites.medinfo.ufl.edu/files/2012/07/qz-DIG02001.swf
This document is linked from Role-Type Classification.