I have been pondering Stadium Effects and RF Range Factor ... If a Stadium Rating 1B Factor is +2 and an OF RF is B is it a 2 step or stage process where Fielding Range has Its Effect and then the Stadium Rating has its effect

https://www.whatifsports.com/forums/Posts.aspx?topicID=519598&threadID=11831758#l_11831758

I think you’ll find that most relevant, especially the last paragraph of that post:

”If it's not a HR, then using a regression from the pitcher ERA and the batters 3B/H and 2B/H, the SIM works to see if it's a + play on defense , or a triple or double the same as the HR above and uses the park effects the same way. Any hits that didn't become HR, + play, 3B, or 2B are singles.”

This paragraph clarifies and solidifies in my mind the fact that if you consider for instance

2016 Ian Kinsler Actual Fielding Stats 2B Grades A-/A+ (.988/5.94) If he makes a + Play at 2B then unarguably this cannot be taken away by the Stadium Effects --- indeed it occurs before this consideration or process ...

Now What exactly is using a regression from the pitcher ERA mean and does it involve #ERC

WikiPedia says "Regression is a statistical method that attempts to determine the strength and character of the relationship between one dependent variable (usually denoted by Y) and a series of other variables (known as independent variables) ...

It’s taking their actual ERA and essentially extrapolating an estimate of a pitchers 2B and 3B allowed rates from the ERA using known 2B and 3B rates to create the estimator. That estimator is then used in place of 2B and 3B allowed rates for consistency across all pitchers. It’s a very very minor effect, but is there

I ReWrote This Paragraph after just4me Answer below ---- "Yes on the 1B factor in performance histories"

So in Performance History for a Batter if the Third Row or Average > Column First Base or 1B is say +1 is that an indication there again of "Hitting Rate" so to speak and not Singles ... "Hit Rate" IS listed under the Pitchers Actual Stats in Advanced Stats ... But we are talking about in Performance History For a Batter > SimLeague Batting Statistics > Third Row or Average > 1B Factor ...

If the sim attempts to see if there is a + or - play does it systematically look in a certain order at every Position Player Fielding Range Factor (RF) (excluding error rating) ...

2016 Ian Kinsler Actual Fielding Stats 2B Grades A-/A+ (.988/5.94) ... Does Sim interpolate 5.94 into a possible (in this case not a minus - Play it would seem) + Play ...

and therefore if the Range Factor was a exact C what would be the Actual number for this C and how would Sim determine if it was ever a + or - Play ?

Yes, on the 1B factor in performance histories.

I’m not sure the exact mechanics of the + play calculation, but would guess it’s something like a curve on where an exact average RRF essentially equals a multiplier of 1 (so no change to the outcome) and RRF above and below that curve up/down, respectively to create a multiplier that would be close to .975 for the best A+ (and similarly a .975 Multiploer on the out decision for the worst of the D-) fielders. That would work out close to around 40+/- plays over the course of the season for the best/worst.

So, in practice, if it was already decided to be a hit a thousand-sided due is rolled and if it’s 1-974 then it stays a hit, if it’s 975-1000, then it might be an out or a reduced XBH, or no change at all depending on the RRF of the fielder. Or something like that or at least works out that way practically speaking.

Thank You