Yes, it is. In that number of PA's roughly 25% of players can be +/- 100 points of their actual production. The other 75% of players will be +/- 50 points. That's purely through luck. You need At Least 1000 PAs to start getting a good handle on their real ability. As was alluded to earlier, what if he goes off for a .326/.395/.515/.910 line over his next 323 PA's? Does that mean he's a #3 hitter? Does that mean he was unlucky those first 323 PAs, or was he really lucky the second 323 PA's. You're basing your proclamation on the equivalent of a half season of production. That's nowhere near enough of a sample. You just made that number up. My point isn't that it's predicative. My point is that there is a reason. Randomness isn't it. His true talent level during those 323 PAs was not his career average. Yes, randomness is it. That's why he could very easily put up the numbers I listed in his next 323 PAs. If the 323 PAs was his actual ability, those numbers would be very close to his overall career numbers (assuming that's his true ability). In looking at 323 PAs, it's very possible he just isn't good as a three hitter, it's also very possible he was just unlucky in those 323 PAs. The point is, with that few PAs, you just don't know what the reason is. As for your first statement, I didn't make them up, I took what Tom Tango, Andrew Dolphin and Michael Lichtman found in their research for The Book: Playing the Percentages in Baseball and roughly translated them to 300 PAs (they skip from 200 to 500 PAs). They did the research on random fluctuations and the percentage of players that would fall within one and two standard deviations of their actual talent level. Like I said earlier, they are rough translations, not exact. My point was that a player can perform well under his true ability, due to bad luck, and that will make a huge difference in his numbers in half a seasons PAs.