Originally Posted by Superdude
That's one of the big knocks against RC if I remember correct. I haven't dug into SABR stuff in years, but wasn't there some thought that RC overrated great hitters because the formula essentially places them in a context of themselves instead of an average lineup? I'm guessing that's why the two numbers don't align.
Yep, it overvalued players with high OBP and high SLG. Someone came up with a formula that tries to counter that, but it's really complicated and involves fractions and stuff. And even that just got the numbers closer, not exact.
For the record, I really like the RC stat and use it all the time. But it's still theoretical and should be used with a grain of salt, like all theoretical stats.