Here are my park factors for Triple A based on last season's data. Honestly, I could do a weighted average of the past three years, but with the weirdness of the baseball plus the realignment, it made no sense to do so. The model was fit as a random effects model, where total runs in a game was the dependent variable and the random effects were stadium and away team. There are better ways of doing this I am sure, but a random effect model is quick and easy.
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