pic: Histogram of # years active for teams that have dropped out

[GeeTwo]

Originally Posted by cbale2000

The results I got were similar, though the averages take into account older teams which plays with the values some.

Quite. I began by dropping all of the teams founded prior to 2000. There are many teams which no longer exist which do not show up in TBA at all. Maize Craze was reportedly played by 28 teams, but there are only 8 teams listed as having been founded in 1992, seven of which still compete. The survival rate of 1992 teams is therefore more like 25% than 87%. Dropping 1992-1999 was a bit arbitrary, but looking at your curve, I probably should have dropped a couple more years.