I know you´ve said this and made this point before, but I don´t buy it. Just about every major leager I´ve heard speak, says sometimes they go through periods where they see the ball better, and other times they go through periods where they don´t. So clearly, if a player is seeing the ball better, that is a time to leave him in. They say they are seeing the ball well when asked to explain a good run of games. That's all well and good but when people actually look to see if a "hot" batter does better than expected going forward, they find very little evidence of of it. Perhaps the studies so far have failed to tease the evidence out of the data but what you suggest is clear is quite the opposite. Some of these things just can´t be categorically slotted away in your statistical boxes. You make these players out to be robots, they aren´t. They are human beings who go through ups and downs. No, I'm telling you if they WERE robots you would STILL see all kinds of streaks. And those streaks the robots experience; humans are subjected to them as well. If there was clear evidence that batters do have have REAL streaks, they would be SIGNIFICANTLY more subject to streaks than my spreadsheet. Taken as a group, humans are only slightly more streaky. Look at "streaky" roboJenkins: http://rluzinski.blogspot...ins-and-consistency.html That's me assuming that each AB is just a coin flip. Take into account the changing skill level of the opposing pitcher, home and away variance, platoon advantages, etc... these robots are streaky as hell! I have no doubt that batters do experience non-statistical-noise hot and cold streaks (especially cold because of injuries), how do you know when it IS just statistical noise (which is much more likely)? Is a manager supposed to ask a batter? "Hey Betancourt, do you think your recent uptick in offensive production is a result of coin-flip luck or are you seeing the ball better recently and expect your good production to continue?" If managers can't differentiate between statistical noise and the real deal, they have to assume noise because that is much more likely. "Plus he only has a history of hitting .111 lifetime against Myers. Not the line I'm looking for." Another thing managers should ignore!