Some Stats Updates
There have been a couple updates made to a couple of the stats on the site and some new data for 2010 added.
1. Total Zone and Total Zone with Location Data (TZL) are now available for the 2010 season. They’re in all the fielding sections, leaderboards, etc….
2. wRC+ has been updated to fix an issue with the league baselines. As a result for 2010, all NL players are now -4.01 and all AL players are -2.58. This will have some effect on all seasons with a similar uniform effect for AL and NL players. Big thanks to Kincaid for alerting us to the issue.
3. Pitcher BABIP has been updated to use TBF instead of estimating AB through IP. This has been a long time point of contention with our BABIP calculation. For years where TBF is unavailable, the old method is still being used (years prior to 1916 and most projection systems). As a result, BABIP’s for pitchers will show as lower than they were, but the baseline is also lower. The ordering of players remains extremely similar and the correlation between estimating AB’s using IP*2.82 and using TBF is about .99. The BABIP formula we are currently using for pitchers is (H – HR) / (TBF – BB – HBP – HR – SO).
David Appelman is the creator of FanGraphs.
Is the 2.82 stationary over time/baseball eras?
Hmm, answer my own stupid question here. If the correlation is 0.99, there is no room for variation of any sort.
Does this mean other stats that incorporate this data have also changed/updated?
There aren’t any BABIP or wRC+ sub stats, or stats that are derivative of them on the site, so this wasn’t an issue.
Thanks.
David – Do you have the average and/or median BABIP, or something approximate, for the present era?
If you incorporated xBABIP along with your revised BABIP category, it would be better off.
Agreed, I saw a really good xBABIP study somewhere on the internet a few months ago.
Dave,
Does Fangraphs have a stat for starting pitchers: Innings pitched/GS.
I looked for it twice (nearly a hour) and couldn’t find it.
Again, you say the baseline is also lower for BABIP… what is it now, then? Otherwise, how to judge that element of potential pitching luck?
The average is about .295-ish now. It was .293 in 2010, .295 in 2009, and .296 in 2008. If you go to any of the player pages in the advanced section and click “show averages” it will give you the averages for each year.
http://www.fangraphs.com/statss.aspx?playerid=1636&position=P#advanced
Any chance you can update the “Quick Glossary” for standard and advanced fielding metrics?
I was looking at them the other day and had trouble deciphering some of the acronyms that have no explanation. For instance, I have no idea what OOZ, BIZ, or FSR stand for.
i think FSR is fans’ scouting report but otherwise can’t help you.
Will fangraphs have Zips projections avaiable anytime soon?