(02-11-2022, 05:28 PM)qwerty49 Wrote: (02-11-2022, 12:51 PM)DC 86 Wrote: (02-11-2022, 11:54 AM)qwerty49 Wrote: (02-11-2022, 08:23 AM)Mick Wrote: Now that Manfred has agreed to the universal DH, Logan Webb has officially hit the last home run by a pitcher in the major leagues, which he did against San Diego on the last day of the year. Shades of Madison Bumgarner.
https://twitter.com/BaseballQuotes1/stat...sco-giants
Hey Mick, in general, how has the DH affected pitching stats? Intuitively it would seem that ERAs, for one, would be higher.
You can't just compare raw AL and NL run scoring statistics because of the different parks, but in general the delta from having a DH is understood to be between 0.1 and 0.2 runs per team per game. Last five seasons the overall ERA in the AL (going backwards) was 4.32, 4.42, 4.60, 4.27 and 4.37 and in the NL was 4.20, 4.47, 4.38, 4.02 and 4.34, i.e. deltas of 0.08, 0.13, 0.22, 0.20 and 0.03.
Hmmm. It would seem a better comparison might be just within the AL, pre-DH vs with DH. Or maybe not -- as the lowering of the mound is probably in there, along with the so-called "livelier ball."
As well as different parks being built, changes in dimensions and wall heights to existing parks, expansion, changes to the strike zone, use of performance enhancers which affects both pitchers and hitters, introduction of defensive shifts, etc. The DH was introduced 39 years ago and the game has undergone dramatic changes resulting in a much different run environment aside from the introduction of the DH itself.
You can simply compare aggregate hitting by pitchers and by batters in the DH spot and then extrapolate the run scoring effect using linear weights, which is why 0.1-0.2 runs per team per game is the currently accepted baseline. It may not sound like much but it's significant.