Race statistics
DNF Rate vs Race Distance
Each point is a race, plotting its distance against its DNF rate. Only races with at least 50 recorded starters are included, so the trend reflects statistically meaningful data.
92
Races plotted
0.63
Correlation (r)
strong positive
0.40
R-squared
Variance explained
+0.13pp/km
Trend
DNF rate change per km
Correlation (Pearson's r) measures how closely DNF rate tracks distance on a scale from -1 to 1, where 0 means no linear relationship. R-squared is the share of the variation in DNF rate that distance alone accounts for, the rest comes from terrain, weather, cutoffs, and field quality.