Originally posted by Sultan_1895-1948
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The home team does have a slight advantage over the road team, other things being equal, but that is not the same thing.
It looks at a players road SA compared to their specific leagues road SA. Using that we get a relative number. It then does the exact same with OBP to get a relative number.
Those numbers are added together, we subtract 1.
We then divide the players league specific OPS+ by 100 to remove pitchers from the league, and multiply it by the former number...then multiply by 100.
The next step is giving the player home, which is multplying by 3 and then adding raw OPS+. This step does something like take Boggs from a 116.0 to 119.7 because we're giving him back Fenway.
Those numbers are added together, we subtract 1.
We then divide the players league specific OPS+ by 100 to remove pitchers from the league, and multiply it by the former number...then multiply by 100.
The next step is giving the player home, which is multplying by 3 and then adding raw OPS+. This step does something like take Boggs from a 116.0 to 119.7 because we're giving him back Fenway.
What do you multiply by 3?
I will have to get back to you on this when I have more time to figure it out. I think you are determining the ratio of the player's road production to league average, then adding that to home production that is modified in some way to take into account park differences. For now, I'll just make two points:
1) OPS is not as good a measure of performance as RC, because it weights OBP equally with SLG, whereas the former should be weighted about 1.7-1.8 times more;
2) while I think road performance is a pretty good measure of a player, since the different parks tend to average out, if you play in a pitcher friendly park, your road environment, on average, is a little more hitter friendly than it is for a player in the same league playing in a hitter friendly park. Park factors I think are the best way we have yet of correcting for problems like these.
Piazza faced specialized relief as a righty in horrible home parks, while catching. I'm not sure how you can look at that, and not be impressed. Past catchers dealt with their own issues. One of them being, that the position used to be much more defense oriented. I get that.
Sure, players in the past might not have faced such tough pitching late in the games. But guess what? Neither did their contemporaries. Which means that their contemporaries also had any advantage of inflated hitting stats resulting from weaker pitching. Any stat that compares a player to league average is going to be affected the same way, regardless of era.
Yeah, I'm not much interested in a stat that doesn't consider how hindered a guy was by his home park. If I was, I might consider Klein in my top 10.
1)We're talking about a catcher here. That has to be worth something in your mind.
2)We're talking about the most specialized relief in history. The most focused on batter in the lineup.
I just think it's funny you keep mentioning that "oh by the way, he played in pitcher parks," as if that's just a side note. No, that's HUGE. That's half his games per season. We're taking care of that problem with rrOPS+. That's how Bill Terry ends up 12 points higher than Larry Walker.
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