isn't it just another way of saying that pitcher has been bad? "Has been bad bad" sometimes but does not always mean, "will continue to be bad". That's the distinction I've been trying to drive home in this thread and I don't think I've done a very good job at explaining it. If we want construct a best guess at Cappy's future expected performance, we have to look not just at the results of Cappy's recent performance (record and ERA) but also at how those results occurred exactly. The fact that his recent struggles has coincided with an increased walk rate is alarming, for instance. In contrast, Bush's sub par ERA and win/loss record was not alarming to me, because it was not caused by anything that was expected to persist (BABIP, LOB%). Some people don't get past just the raw results, so they miss that distinction. Who said anything about accepting a poor performance? ELCABALLO45 did, not you. Sorry if I didn't make that clear. You routinely cross the line to smug by trying to force sabermetrics on people, The concept of sample size, statistical noise and regression to the mean are principles that dictate all the baseball stats we all look at on a daily basis. If continuously pointing that fact out when it comes up constitutes "forcing" it, guilty as charged. Most likely the difference between us is that I've been in locker rooms and around teams August through June since I was old enough to walk and talk. This seems to blow up everyone's crude stereotype of what a guy who uses math is all about but in high school I was on the math team AND I played football. Crazy, huh? While I may not have spent my entire life in a locker room, I am familiar enough with it's pungent aroma to appreciate what you are trying to get at, but... Ultimately I believe what goes in the player's head is vastly more important than his talent. In high school? Sure. I got by with mediocre physical talent because I understood the techniques associated with my position and I was a hard worker. I knew better than to think that recipe would translate into success at the college level, however. At the pro level? Please. High school sports has almost no resemblance to professional sports. how long do you ride an unperforming horse? When is the right time to the make the move? How many games can you give away before you've significantly hurt your playoff asperations?...Those are the questions we should be debating, not what stat or metric is proper for the sample size. That's exactly what we are debating, you just don't seem to realize it.