Program Rankings
Programs, updated now for 2023, are ranked on their overall team strength, attrition rate, and swimmer improvement. A
small attrition rate, a high strength rating, and a high positive swimmer improvement percentage are good. A
program's ranking in all three is combined - adding together the z-scores in each category - to find their overall
rank.
Attrition is the percentage of non-seniors who do not return to swim the following year to that same program
across the 2012-2020 timeframe.
Improvement is the average percentage change in times in a swimmer's top three events from one year to the
next.
Strength is the team's average invite-level strength from 2013-2020.