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If folks don't realize the problemos with using WPA to predict the next season's WPA, sure...
Wondering idly. If you took the >0.00 WPA's from 2008 and from 2009 and weeded the players who weren't in the league in either year... what do you think the CORR would be? 0.50 maybe?
If you're trying to predict ERA, there are better stats for that than ERA itself. But as y'know, ERA still contains information that FIP doesn't...