Abstract: A first subset of results, from testing a first version of an item versus a second version of the item, is accessed and displayed. The first subset includes first values associated with the first version and second values associated with the second version. The first subset is determined according to settings for parameters associated with the data. A representation of the first values includes a first band having a first width corresponding to confidence intervals for the first values, and a representation of the second values includes a second band having a second width corresponding to confidence intervals for the second values. In response to a change in the settings, a second subset of the results is automatically determined, accessed, and displayed and the first width and the second width of the first and second bands are automatically updated and displayed.