According to one embodiment, an apparatus stores a plurality of datapoints. A datapoint comprises a first value and a second value that depends upon the value of the first value. The apparatus associates the datapoint with a group from a plurality of groups. The group is associated with an identifying range and the datapoint is associated with the group based at least in part upon the first value of the datapoint and the identifying range of the group. The apparatus calculates a median of the second values of the datapoints associated with the group and a performance value by performing a regression based at least in part upon the identifying range and the calculated median of the group. The apparatus determines that the performance value exceeds a baseline value and in response, presents, on a display, an illustration depicting the identifying range and the associated median of the group.