This feature is available in Ultimate edition only.
Use the Test Trend report filtered to Test Sets to focus on the progression of regression testing results.
Data for test sets roll up into other common reports as well. Estimate values are included in project burndowns and velocity graphs; To Do information is included in sprint burndown graphs, and test results are included in the existing test trend report. To view data for regression testing alone, use the Workitem filter in views of the backlog and in reports to focus on the data generated from test sets.
With Ultimate Edition, custom reporting on Regression testing can also be created with Analytics.