| Percentiles tell you where an object ranks on a distribution. The median of a distribution is the 50th percentile. If an object is in the 75th percentile, only 25% of the population ranks higher than it on the metric of interest.
An index tells you how above or below average an object is relative to the norm. The average (or the norm) is represented by 100. If something has a 500 index, this means that it is 5X the average. For the sake of accurate comparison, the 'norm' benchmarks against similarly categorized objects in the selected market vertica. |
