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Actually that's exactly what I thought you said.
But the Rider Down forum isn't self-reported, and the thread contained therein has far too small a sample of actual reports (a minority of the forum users use it) to represent any meaningful interpretation of the data.
Both fail, for different reasons.
If there was a way to have all UK cycling fora talk to each other, along with the major cycling publications, to support a large survey... then I'd support it 100%. But a statistically meaningless sample of biased data from a biased group is worse than useless. If any data scientist or statisician argues otherwise, they're basically bad at their job.
Yep, agree with all that - that's why I said it'd probably be more useful in the forum rider down thread than in the general forum itself, as forum rider down tends to be self-reporting, not people making reports for other people.