from Amazon
Friday, March 27, 2009
2.5 mph = .025 K per PA = 0.25 ERA
More or less, roughly speaking.
kwERA, which is 5.4 - 12*(K-BB)/PA, would imply a change in ERA of 0.30. Since I like simple numbers, then we can say that 1 mph = .01 K per PA = 0.10 ERA. Going back to Tobin’s paper from yesterday, then his estimate of 0.50 in ERA is bang-on.
When I looked at some pitchers as starters and as relievers, it looks like they gained somewhere from .05 to .10 K per PA. Obviously, they don’t throw 5 to 10mph faster. I can only presume that in addition to the speed gain they have as relievers (say 2-3 mph), they have an equal (or better) gain in movement of pitches, plus of course the advantage of not facing the same batter multiple times.
Recent comments
Older comments
Page 320 of 342 pages « First < 318 319 320 321 322 > Last »Complete Archive – By Category
Complete Archive – By Date