So if win shares are predicated on pythagorean record, how do we know that the pythagorean projections are correct? I mean no stat is perfect right? There are always some variables at work that any given stat can't take into account. This isn't me just being argumentative, I just wonder sometimes about some of these sabermetrics. and for that matter why didn't Bill James use the pythagorean record? You know, I DID mathematically state and prove this 2 pages ago or so.... "You know, win shares are great most of the time, but many use them as a failproof way of determining player value, when, in fact, the stat does have a large flaw which most overlook: Players who play for teams that win more games than expected, (found by using the Pythagorean expectation), will receive more win shares than players whose team wins fewer games than expected. Beacuse a team going over or falling short of its Pythagorean expectation comes to such a conclusion by chance (according to Bill James anyway), you cant give out credit based on wins. (and no, I'm not just making this up, you can read into it) Sure enough, when calculating the Pythagorean expectation for Stl, the winning % is .629, lower than their actual % of .634. They are winning more (albeit a bit more) than expected due to chance. but that's not all... The Cubs have a much greater difference from expectation to reality, and of course, they've got the short end of the stick. Pythagorean expectation for the Cubs: .491 Actual winning % for the Cubs : .474 The Cubs are losing more than expected, due to chance, and are doing so by a much larger margin than the Cardinals are winning due to chance. So... Pujols is getting more win shares than he deserves, and Lee is getting less than he deserves, due to chance, and not value. I wouldn't have mentioned it if everyone wasn't making such a big deal over winshares and how the two were tied. Winshares are usually great, but in this case, they're flawed, and in reality, Lee has the advantage. " -ConstableRabbit, Sept 2 2005