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By this data, runners whose point falls above the line (Nick C., Ryan, Cat, Tina, me) have marathon times that are disproportionately faster than their Towers PR. Runner's whose point falls below the line (Sam, Jenn, Slusher, Kyle, Felix) have had faster runs up Towers than in a marathon by comparison to the mean.
Of course this comparison has many flaws (insufficient data points, marathons were run on different courses, data does not have a sufficient spread over the times, etc.) but there is enough information to make some statements or predictions about a runners' potential in one event when compared to the other. For instance, to run a 3 hour marathon, one should be able to run 33:40 on Towers. Likewise, someone who can run a 30 minute ascent on Towers should be able to run a 2:46 marathon.
If you have a recent marathon time and a Towers time and I have not included you in the plot, please let me know, I can always use more data. A 5K/Towers plot and a 1/2 marathon/Towers plot would be interesting as well, so if you have that data please send it my way. And next time you see Nick on Towers and he runs anything slower than 27:30, be sure and ask him, "What happened?"