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Deanouk
RE: A closer look at EPO-era performances
Great analysis Rekrunner, which shows, in my eyes at least, that there was a big impact on standards post 1990 from EPO.
And the fact that the % improvement gets greater the longer the distance, reinforces that further.

3 things that sprung to mind are:

1) When stating there has been a 1.1% improvement in the 1500m for the top 5 East African men post 1990, compared to the pre 1990 top 5 average, isn't it relevant that of the 5 men in that pre 1990 group, 2 were British? Wouldn't it be even more telling if you used the average of the top 5 East African performers pre 1990, when looking at the % improvement in that group post EPO? In which case I think you'll see an ever bigger % improvement.

2) Despite the nonsense spouted by others on here, I do think that there has been a slight improvement in the general speed of tracks since 1990, although how much that is I don't know.

3) Have you tried doing the same analysis with bigger sample groups? Probably not yet as I can imagine its very time consuming, but maybe you could repeat for the top 10 performers?

Cheers

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