In one embodiment, a method includes receiving a plurality of measurements, each measurement associated with a different parameter, calculating an index based on the measurements, and generating a visual index display indicating the index, the visual index display comprising a first portion and a second portion, each portion configured for selection by a user. A first set of measurements is displayed when the first portion is selected and a second set of measurements is displayed when the second portion is selected. The first set of measurements is a subset of the second set of measurements. An apparatus and logic are also disclosed herein.