Comments on: wOBA

By: Erin Andrews

Erin Andrews — Thu, 10 Nov 2011 01:56:21 +0000

I as well as my guys ended up studying the great secrets and techniques found on your web site while instantly came up with a horrible feeling I had not thanked the web site owner for those techniques. All the ladies happened to be totally thrilled to see all of them and have pretty much been taking advantage of them. Many thanks for indeed being so thoughtful and also for choosing certain helpful subject matter millions of individuals are really eager to know about. Our own sincere apologies for not expressing gratitude to you sooner.

By: plastic surgery

plastic surgery — Sun, 06 Nov 2011 05:52:34 +0000

Amazing blog! Is your theme custom made or did you download it from somewhere? A design like yours with a few simple adjustements would really make my blog shine. Please let me know where you got your theme. Thanks

By: Tragaperra Spiderman

Tragaperra Spiderman — Sun, 25 Sep 2011 04:41:28 +0000

excellent areoter with fagud sunsune for treave edunbe. cojunt have carial that ceasing it corry and precoting, scimived proven.

By: Tim

Tim — Wed, 14 Jul 2010 01:44:55 +0000

When calculating wOBA w/o ROE stats, do you just leave that out of the calculation altogether, or use an assumed number for each player?

By: Samg

Samg — Sun, 08 Feb 2009 22:59:47 +0000

Why is the value of the out subtracted from the weights? I never understood this.

By: Ryan Glass

Ryan Glass — Tue, 02 Dec 2008 20:20:55 +0000

In the irony of all ironies, I actually had those weights on the next tab and didn’t even think to use them. Thanks again.

By: Ryan Glass

Ryan Glass — Tue, 02 Dec 2008 20:19:23 +0000

Thanks

By: David Appelman

David Appelman — Tue, 02 Dec 2008 20:15:10 +0000

Ryan, the actual weights used on FanGraphs are based off these calculations: http://www.insidethebook.com/ee/index.php/site/article/woba_year_by_year_calculations/

And the final results of those calculations are here: http://tangotiger.net/bdb/lwts_woba_for_bdb.txt

The final weights that are calculated at FanGraphs are essentially the same as the ones presented in that file, though there might be extremely small differences. We don’t round numbers behind the scenes.

Second, we are not using RBOE because we just don’t have that.

Third, we only use NIBB when available. IBBs are not available before 1954 (or something like that), so before that we just use all BBs.

Finally, our career wOBA lines reflect the different weights for different seasons, so you would need to individually calculate each season’s wOBA and then weight each wOBA appropriately in a full season calculation.

Also, if you are doing a quick calculation for wOBA, I believe .+0.25 and -0.50 are better for the SB and CS. If you look at that file, most of the recent CS weights are near -0.50.

As you can see, there’s a bit of heavy lifting done behind the scenes mainly because we have to account for over 100 years of baseball, but if you use Tango’s standard calculation I think your numbers will come out very close to those on FanGraphs, assuming you change the weights on your CS and SB, mainly the CS one.

By: Ryan Glass

Ryan Glass — Tue, 02 Dec 2008 19:45:05 +0000

So, I am getting a spreadsheet together with wOBA to try to rank some players in context. I have calculated wOBA using Tango’s original formula ((0.72xNIBB + 0.75xHBP + 0.90x1B + 0.92xRBOE + 1.24x2B + 1.56x3B + 1.95xHR) / PA), done it w/ just BBs instead of NIBB, and used SB/CS (+.22 for SB and -.38 for CS). Yet somehow I still end up w/ different values. I’d like to use the same formula so I can refer readers over here, but I can’t seem to get the exact formula down…

HELP!

By: David Appelman

David Appelman — Tue, 02 Dec 2008 19:21:19 +0000

No problem Reggie. There’s an interesting thread on the value of the IBB over at insidethebook.com. It starts here at comment #21 and continues for a bit: http://www.insidethebook.com/ee/index.php/site/comments/rob_neyer_touts_woba/#21