Green and Zwiebel studied two million MLB at-bats from 2000 to 2011. They neutralized for the abilities of the hitter and pitchers — such as lefty-on-lefty matchups and stadium sizes — and focused on 10 major statistical categories, such as batting averages, home run percentages and strikeout rates.
They found that a hitter’s past 25 at-bats were a significant predictor of his next at-bat. When a player is hot, they found his expected on-base percentage to be 25 to 30 points higher than it would if he were cold. Home run rates jumped 30 percent and strikeout rates dropped. For pitchers in hot streaks, future performance was improved, too.
“The effect is fairly large,” Zwiebel said. “It’s highly significant not just in the statistical sense but the strategic sense. The effect is large enough where it makes sense for managers to sit a cold hitter or play a hot hitter, or perhaps the strategical adjustments for a pitcher to pitch around a hot hitter.”
Login to Join (8 members)
Page rendered in 3.2213 seconds, 84 querie(s) executed