Speed Score

We’ve added Bill James’ Speed Score to the player pages, leaderboards, and team pages.

We’re using the 4 component version, which is an average of Stolen Base Percentage, Frequency of Stolen Base Attempts, Percentage of Triples, and Runs Scored Percentage.



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David Appelman is the creator of FanGraphs.


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Decatur
Guest
7 years 4 months ago

Apologies if you’ve answered this before, but a) are Speed Score’s incorporated into players win values and/or wOBA? and b) how much can adding speed scores to the site alter the valuation of a player, both in extreme cases and on average?

Jerry
Guest
Jerry
7 years 4 months ago

I heart FanGraphs. Seriously.

devil_fingers
Guest
7 years 4 months ago

David:

Another cool thing added. I actually put together my own 4-component SS SQL, but the scores came out lower that I expected, although so far they seem to be about the same as yours. Perhaps, as in the “standard” version, the lowest number needs to be dropped before averaging?

That’s meant as a question, not a criticism.

Toffer Peak
Guest
Toffer Peak
7 years 4 months ago

Could you explain how you measured each of the four components (Percentage of Triples = 3Bs/ ABs? 2Bs? Hs?) and how they are weighed (z-scores?). Thanks.

Mike Podhorzer
Guest
7 years 4 months ago

David, great addition, but: Why is the runs scored percentage included? Obviously the hitter’s lineup will also influence this number, so it doesn’t really tell you what you want. If Jacoby Ellsbury was on the Giants (fewest runs scored this year), then his runs scored percentage would be lower, but of course his speed hasn’t actually changed.

dan
Guest
7 years 4 months ago

Is it just me, or are the top speed scores way down from last years? I’m pretty much eye-balling the top 15, and they’re significantly lower than they were in 2008. And 2008 they’re slightly lower than in 2007.

Ron
Guest
Ron
7 years 4 months ago

I think at least part of the difference between this year and last has to do with the small sample size so far since Stolen Base Percentage is given as a counting stat. Extrapolating Michael Bourn’s stolen base production over a 162 game schedule, for example, would boost his SBP score from 4.9 to 7.2 and his Speed Score from 7.8 to 8.4.

It’s small, I know, but if you add just a few tenths to everybody’s score I think you’ll find this year’s leaderboard looking a lot like last year’s, or you could give it a few months and it’ll probably catch up on its own.

dan
Guest
7 years 4 months ago

I also think it would make sense to adjust the triples % and runs scored % for ballpark and lineup. Some parks are tailored for triples and obviously some lineups score more than others. The difference probably wouldn’t be huge.

Scaling runs scored % to team runs per game would work, and using this article below (used by statcorner) would do the trick for triples.
http://www.hardballtimes.com/main/article/batted-balls-and-park-effects/

pm
Guest
pm
7 years 4 months ago

I would also add an Infield hit and GIDP component to this. That would make it more accurate.

Jeffrey Gross
Guest
7 years 4 months ago

Hey David,

Can we get ISO against on this site? I know that doubles and triples have more luck (due to factors like fielder positioning) involved in their affect on ERA and the likes, but a guy who doesnt give up a lot of HRs but does consistently give up doubles will have a better FIP than a guy who gives up HRs but weak contact otherwise.

I think it would be a great additional stat for the site!

dan
Guest
7 years 4 months ago

“a guy who gives up HRs but weak contact otherwise.”

Such a player doesn’t really exist. Well ok that might not be 100% true. Players who may exhibit this trait are likely the result of noise (random chance) than underlying skill. What you’re proposing would probably fluctuate even more wildly than BABIP.

Jeffrey Gross
Guest
7 years 4 months ago

*effect

Bodhizefa
Guest
Bodhizefa
5 years 2 months ago

I’d be curious to know if there was a good way to add bunt hits into the score. After watching Trout beat out what looked like a mediocre run-of-the-mill bunt last night, it got me wondering why bunts aren’t a part of the speed score calculation.

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