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When I had the chance with the folks who run this enjoyable slot machine, proposed each card include a 'performance rating' or band, by league or total, that 'visualizes' that card's week to week activity.
Like Bollinger Bands and other std. deviation in financial markets. So you can look at your Satchel Paige, see highs/lows and mean reversion. Boy, would it affect card shop pricing, There are gems out there but the data is so hard to gather.
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