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I'm trying to learn a little bit of R while playing with this league. Here's a graph of the ratings value in MLB by age - a quick look at aging. If I remember correctly from some real-life MLB aging studies, it is better to look at these values weighted by PA and normalized for overall career value since better players are more likely to stick around for longer - survivor bias? But I also remember that there was not a ton of difference once corrected.
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