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Originally Posted by butterfly
No, it doesn’t mean that it is dependent upon variables that are not captured. If you think so, please provide evidence. Otherwise, I could use the same logic to argue that winning the lottery requires skill.
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You realize, don't you, that your argument is convertible to a statement that playing goal in the NHL does NOT require skill? Which is absurd on the face of it.
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With respect to GSAE, it is possible to assign values to it prior to the development of the statistic, as has been done with WAR and historical baseball seasons.
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Not unless you have the raw data for shot quality, which were not collected with any rigour in the earlier part of the period.
Baseball is a different animal. There is only one pitcher and one batter at a given moment, they remain in fixed locations until the ball is hit, and there is no interaction between the batter and other members of the offensive team. Among major professional sports, it is uniquely easy to analyse.