Comments on: Win Values Explained: Part One

By: JAYjay

JAYjay — Thu, 29 Jul 2010 16:43:48 +0000

So….. essentially the Batting Value is wRC+, with a different scale?

By: Kevin M. James

Kevin M. James — Thu, 19 Mar 2009 22:52:19 +0000

Okay, I’ve been trying to reverse-engineer these nifty statistics so I can use them for a fictional simulated baseball universe. (Yes, I’m a sim-game geek.) I keep hitting walls though…I guess I don’t quite understand this stuff well enough yet.

I think I’ve managed to fake it regarding adjustments for run environment. I hold no hope for being able to do the full wOBA year-by-year calculations as described, as the Baseball Databank obviously doesn’t apply, and even if it did the SQL is Greek to me. But I can gin up a runs-per-out number for a season in my fictional league, and compare that and the home run total to past years to find a decent fit in the Iwts_woba spreadsheet, and I can live with that for now.

I’m really stuck with the park adjustments though. I’m trying to get from wRAA to the Batting value, but just can’t figure out the correct equation to put into Excel–or if I’ve found the right park adjustment data at all. I’d hoped there was a simple factor I could multiply the wRC or wRAA by…but it’s obviously more complicated than that. I’m stumped, and have no idea how to get to the Batting value figures found here.

By: Paqs

Paqs — Thu, 26 Feb 2009 09:19:40 +0000

“As much as I love WPA/LI, it’s just never going to be something that the casual fan is going to understand without a good bit of explanation. Win values, though – I can tell my mom that Adrian Beltre is a four win player and she’ll understand in 30 seconds.”

Actually, I tried to explain this to your mom, and she still didn’t get. Ba dum tish!

I’ll get my coat.

(Btw I’m not a troll and I love your work, keep it up)

By: IvanGrushenko

IvanGrushenko — Fri, 16 Jan 2009 03:28:11 +0000

Where can I find park adjusted Batting Runs for players before 2002? Why bother publishing the non-park adjusted Batting Runs at all?

By: Dave Cameron

Dave Cameron — Tue, 30 Dec 2008 19:02:27 +0000

David used the Odds Ratio Method of calculating park factors.

By: Rob

Rob — Tue, 30 Dec 2008 04:45:14 +0000

How are the park adjustments done? Is this information available on the fangraphs website, too?

By: Colin Wyers

Colin Wyers — Tue, 30 Dec 2008 02:45:09 +0000

“Scale” is used to fit wOBA to the average OBP of that season. I believe stock wOBA uses a scale of 1.15. (That’s the 15%.)

As for the weights, I presume you mean these:

HR 1.70, 3B 1.37, 2B 1.08, 1B 0.77, NIBB 0.62.

Those are simply linear weights values above the out. If the LWTS value of an out is -.30, then you get:

HR 1.40, 3B 1.07, 2B 0.78, 1B 0.47, NIBB 0.32

As for how you figure out those weights… I’ll try and give the thumbnail sketch version here.

Every base-out state — as in, bases empty, no outs; or runner on second, one out — has an expected run value, or the average number of runs that score between now and the end of the inning. The linear weights value of an event is the average change in that run expectancy after that event.

By: Matt H.

Matt H. — Tue, 30 Dec 2008 02:10:35 +0000

google “the book”, or Tom Tango. I believe his blog has all the weights

By: Matt H.

Matt H. — Tue, 30 Dec 2008 02:09:26 +0000

Thank you, that is exactly what i meant.

By: thephaithful

thephaithful — Mon, 29 Dec 2008 21:57:36 +0000

Where is the ‘scale’ found? Im pretty much following everything except this 15% line. Also, where I can read more on HR = 1.72 and single = .77 ?

Very interesting stuff.