The Analytics Team at Mal Warwick | Donordigital is pleased to re-release the Response Significance Calculator, a quick and handy way to test the statistical significance in response rate between two test panels when working on a direct response marketing project. When using this Calculator make sure that the two test panels were randomly split from the same population of donors, and that there were no differences between the two panels except for the test. For example, if you were testing an email subject line, both emails should have launched at the same time and had the same content. To use the calculator, enter the number of contacts and number of gifts for each of the two test panels, and then choose the calculate button. Click here to use the Response Significance Calculator. Peter Schoewe is a Vice President and Director of Analytics at Mal Warwick | Donordigital, a full-service, integrated fundraising and advocacy agency serving leading charitable organizations.