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May 7, 2014
BP Daily Podcast
Effectively Wild Episode 444: Questions of Science and Progress
by Ben Lindbergh and Sam Miller

Ben and Sam answer listener emails about replay and umpires, home field advantage, picking a front office to follow, and more.
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Ben Lindbergh is an author of Baseball Prospectus.
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Sam Miller is an author of Baseball Prospectus.
Click here to see Sam's other articles.
You can contact Sam by clicking here
<< Previous Article
Prospects Will Break Y... (05/06)
|
<< Previous Column
BP Daily Podcast: Effe... (05/06)
|
Next Column >>
BP Daily Podcast: Effe... (05/08)
|
Next Article >>
Fantasy Freestyle: Neg... (05/07)
|
One reason why LHSP have seen their winning percentage decline lately - teams are familiar with the historical numbers and get suckered into confirmation bias, thereby lowering the selection selection standards for using lefties under the assumption that, by simple virtue of using lefties, they will be better.
One way to test this theory is to eliminate the guys who have only short trials as starters in the show. Focus only on - say - lefties who started at least 10 games in a given season.
Lefty winning percentage was higher in the 2000s than it had been for many decades. You're saying this supposed bias *just* started four years ago? Further, lefty winning percentage was highest in the decades when teams gave the most starts to lefties, so the opposite of this hypothesis.