- The historical probability of drafting a five-year starter at a playing position in a Draft Range, divided by
- The historical probability of drafting a five-year starter at that same playing position in all later Draft Ranges, times
- 100
- NA denotes that no player at that position was selected in that Draft Range, making a calculation impossible
- A higher Index means that history suggests there is more urgency to draft a player at that playing position in that Draft Range.
- An Index of 100 means that players drafted later have the exact same level of success as those drafted in the current Draft Range.
- An Index of less than 100 indicates that players drafted later have actually had more success than those in the current Draft Range.
- The only position where the Index is lower than 100 is wide receiver in Draft Range 7, indicating that Draft Range 8 wide receivers have actually done better than Draft Range 7 wide receivers.
- The sole purpose of the Index is to allow comparisons within a Draft Range
- Any comparisons between or among Draft Ranges are useless
- An Index is more meaningful with more data points
- Quarterbacks have fewer data points than the other positions included in the Index
- Draft Range has only 60 data points in total, so the Index is less helpful for the earl picks