Response-rate ratio

{{short description|Measure of efficacy in clinical trials}}

{{refimprove|date=June 2012}}

Response-rate ratio is a measure of efficacy of therapy in clinical trials. It is defined as the proportion of improved patients in the

treatment group, divided by the proportion of improved patients in the control group.{{citation needed|date=June 2012}} The same term has been used in marketing.{{cite journal |jstor=1250681 |pages=71–73 |last1=Berdie |first1=D. R. |last2=Anderson |first2=J. F. |title=Mail Questionnaire Response Rates: Updating Outmoded Thinking |volume=40 |issue=1 |journal=The Journal of Marketing |year=1976 |doi=10.2307/1250681}}