we understand very clearly which genes cause irish people to have red hair and we have good theories as to why they were selected
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e.g. easy for baseball scouts to identify that say, byron buxton has more hitting ability than eric sogard despite sogard's better results
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I would be surprised it it were literally impossible to make a number correlated with people's ability to hit a ball in a game.
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I agree that you couldn't perfectly measure underlying hitting-ability, but I don't think anyone thinks you can perfectly measure g.
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I feel like if Yankees consistently got higher batting average than Red Sox, would be a good start to saying Yankees are better at hitting.
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Though maybe my lack of knowledge of baseball means I've accidentally stumbled into a terrible analogy that disproves my point.
End of conversation
New conversation -
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batting average is a noisy (and incomplete) record of results rather than a predictive measure of underlying ability
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