Evaluating the Impact of Value-Based Purchasing Figure 5. quivalent Comparison Group Figure 5. Nonequivalent Comparison Group[D] Select for Text Description.Return to Document Current as of May 2002 Internet Citation: Evaluating the Impact of Value-Based Purchasing: Figure 5. quivalent Comparison Group. May 2002. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/professionals/quality-patient-safety/quality-resources/value/valuebased/vbpfig5.html