# Pitch Type Linear Weights

You may have noticed a new section in the player pages called “Pitch Type Linear Weights”.

First of all a huge thanks goes out to Dave Allen and his tremendous work over at baseballanalysts.com. With his help, we’ve implemented his linear weights by pitch framework using the Baseball Info Solutions pitch type data.

What this section does is it uses linear weights by count and by event and breaks it down by each pitch type so you can see in runs the actual effectiveness of each pitch.

There are two stats for each pitch type. The first one is preceded by a “w” and this is the cumulative runs above average for a particular pitch type. Then there are the statistics trailed by “/C” which denotes runs above average per 100 pitches of that type.

This is kind of a first stab at the data and the weights we’re using are per an actual event, so singles, doubles, triples, etc… are weighted properly using data from 2005-2008. Behind the scenes we’re also calculating the data by batted ball type, so there’s always the possibility of displaying a “defense neutral” runs above average by pitch type as well.

Right now we’re only showing this in the pitcher’s stats pages and for the Baseball Info Solutions data. I expect over the next month that we’ll roll this out in the PitchFx sections and the leaderboards and maybe even for Plate Discipline stats.

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David Appelman is the creator of FanGraphs.

Guest
Hero 3
7 years 4 months ago

So, when Felix Hernandez has a 5.8 wFB, does that mean he prevented, or allowed, 5.8 runs compared to average with his fastball?
In other words, are higher or lower numbers better?

Guest
7 years 4 months ago

This looks amazing, but could you explain further what these stats mean? Do they merely break down a pitchers’ results by pitch type, or do they give the expected value of each pitch type based on its Pitch f/x data? In other words, does Felix’s value mean that we would expect him to prevent 5.8 runs for every 100 fastballs based on his movement, location, etc., or that he has been effective with his fastball so far this season?

Thanks!

Guest
Jake S.
7 years 4 months ago

I’m blown away. I don’t know what I’d do without FanGraphs.

Thank you Mr. Appelman, your work is very much appreciated.

Guest
7 years 4 months ago

Can you give us an idea of what terrible, average, and really good numbers might be for a pitch?

Guest
Matt Harms
7 years 4 months ago

You guys are amazing. This is more evidence that BR and FanGraphs are probably the best two places for the stat-leaning and sabermetric community.

Guest
7 years 4 months ago

This is great. I was wondering if FanGraphs could have a xBABIP column added to the players’ profiles. I’m referring to the formula put forth by Hardball Times http://www.hardballtimes.com/main/article/batters-and-babip/

Guest
Rory
5 years 5 months ago

My name is Rory, and May 20th is my birthday.

What a coincidence to stumble across this post.

Guest
Jake
7 years 4 months ago

Fangraphs is not far away from officially being the only baseball statistics source ever needed for anything.

Guest
Eric Cioe
7 years 4 months ago

Totally agreed.

This new feature is really, really cool. I’m still not entirely sure how it works, but I like it. One way to make it just a little cooler: make it a sortable category. We can see who throws the most fastballs, or who throws the hardest fastball, and now we’ll be able to see who saves the most runs with his fastball.

Guest
Justin
7 years 4 months ago

Thanks for the stats.
Does that mean we can expect more from D-train?

Guest
7 years 4 months ago

I’ve got a question, how much would a really poor (or good) defense effect these run values?

Guest
7 years 4 months ago

So if I add together the 2009 runs above average for each pitch type from a pitcher, how will that compare to the “Value” group of stats below that shows the pitchers RAR. For example, if I take Clayton Kershaw’s 2009 pitching stats, and add his pitch types up I get a total of 6 runs above average, and his RAR is listed as 8 runs above replacement. How to get these two stats to talk apples to apples, or is that impossible? Thanks.
vr, Xei

Guest
drew
7 years 4 months ago

Beyond awesome. Thanks David A!

Check out Randy Johnsons slider. You won’t believe it if I told you.