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  1. #1
    Zep's Avatar
    Zep is offline Another Caucasian, Gary.
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    Sabermetrics School and Analysis

    C & P'd from below

    Statcorner Glossary

    FanGraphs Glossary

    Quote Originally Posted by Jilly Bohnson View Post
    Courtesy of the links above:

    BABIP - Batting Average on balls put into play. A pitcher's average on batted balls ending a plate appearance, excluding home runs. Based on the research of Voros McCracken and others, BABIP is mostly a function of a pitcher's defense and luck, rather than persistent skill. Thus, pitchers with abnormally high or low BABIPs are good bets to see their performances regress to the mean. A typical BABIP is about .290.

    EqA - Equivalent Average. A measure of total offensive value per out, with corrections for league offensive level, home park, and team pitching. EQA considers batting as well as baserunning, but not the value of a position player's defense. The EqA adjusted for all-time also has a correction for league difficulty. The scale is deliberately set to approximate that of batting average. League average EqA is always equal to .260. EqA is derived from Raw EqA, which is (H + TB + 1.5*(BB + HBP + SB) + SH + SF) divided by (AB + BB + HBP + SH + SF + CS + SB). REqA is then normalized to account for league difficulty and scale to create EqA.

    OBP - On-base percentage. (H + BB + HBP) divided by (AB + BB + HBP + SF). For pitchers, OBP is on base percentage allowed.

    SLG% - Slugging percentage (hitters) or slugging percentage allowed (pitchers). Total bases divided by at-bats.

    OPS - On Base Percentage + Slugging Percentage

    VORP - Value Over Replacement Player. The number of runs contributed beyond what a replacement-level player at the same position would contribute if given the same percentage of team plate appearances. VORP scores do not consider the quality of a player's defense.

    BB/9 - Walks allowed per every 9 innings.

    K/9 - Strikeouts per every 9 innings.

    K/BB - Strikeout to Walk ratio

    WHIP - Walks plus hits allowed per inning pitched.

    wOBA - The statistic wOBA (weight on base average) is now available in the player pages, leaderboards, team pages, my team pages, and the projections. wOBA, created by Tom Tango, is a version of linear weights that has been weighted to fit an OBP scale. The weights have been properly adjusted by season and for the minor leagues by season and by league.

    Linear Weights - This is kind of long winded, but go here for an explanation.

    There's many more, we'll add as they come up.
    Last edited by Zep; 07-24-2009 at 12:54 PM.


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  3. #3
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    The Simple Questions Thread

    Have any questions that aren't relevant in any future/present thread? Then ask them here. Someone will either answer them, or better yet, link you somewhere where your question will be answered.

    Oh, and there's already a good mailbag here:

    http://www.tangotiger.net/wiki/index.php?title=Mailbags

    Though, this is more advanced stuff.
    Last edited by Seamhead; 06-22-2009 at 01:26 PM.

  4. #4
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    Yeah, we're going to make this the simple question thread. What's OPS? What is UZR? Quick and easy stuff go in here, harder stuff can get it's own topic.


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    Quote Originally Posted by Jilly Bohnson View Post
    Yeah, we're going to make this the simple question thread. What's OPS? What is UZR? Quick and easy stuff go in here, harder stuff can get it's own topic.
    Maybe a stickied thread of a glossary of terms would be helpful?

    EDIT: Nevermind you guys are way ahead of me.

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    Agreed. Feel free to change the title to "Simple Questions Thread".

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    Woba please. I consider myself fairly smart, but I can't wrap my head around it as described in The Book or by Rob Neyer, so in simple terms please.

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    Quote Originally Posted by Pavelb1 View Post
    Woba please. I consider myself fairly smart, but I can't wrap my head around it as described in The Book or by Rob Neyer, so in simple terms please.
    Okay, so basically it goes like this. You know how stuff like a single, a double, a walk, and a homerun, etc. each have a run expectancy attached to them? That is, for example, a single is worth let's say half a run, meaning for every single that is hit it generally leads to half a run scored on average. Well what wOBA does, is it takes all of what a player did, all their singles, doubles, homers, etc., attaches their run expectancy for each of those events, and then multiplies them by certain mulitpliers that make wOBA on the same scale as OBP to make it easier to understand. So for example about .335 would be average, .350 would be pretty good, and .400 would f'ing awesome.


  9. #9
    Zep's Avatar
    Zep is offline Another Caucasian, Gary.
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    wOBA's actual formula looks like this in case you're ever bored and want to calculate for yourself:

    wOBA = (0.72xNIBB + 0.75xHBP + 0.90x1B + 0.92xRBOE + 1.24x2B + 1.56x3B +1.95xHR) / PA
    That is, (.72 x Non-Intentional Bases on balls + .75 x Hit-by-Pitch + .90 x Singles + .92 x Reached Base on Error + 1.24 x Doubles + 1.56 x Triples + 1.95 x Home Runs)/Total Plate appearances.

    wOBA (from my understanding) is basically OBP, but each specific event that leads to a batter reaching base is given a specific value, or weight (a triple is worth more than a double, a double is worth more than a walk, etc.).
    Last edited by Zep; 06-22-2009 at 02:42 PM.


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    Quote Originally Posted by Zep View Post
    wOBA's actual formula looks like this in case you're ever bored and want to calculate for yourself:



    That is, (.72 x Non-Intentional Bases on balls + .75 x Hit-by-Pitch + .90 x Singles + .92 x Reached Base on Error + 1.24 x Doubles + 1.56 x Triples + 1.95 x Home Runs)/Total Plate appearances.

    wOBA (from my understanding) is basically OBP, but each specific event that leads to a batter reaching base is given a specific value, or weight (a triple is worth more than a double, a double is worth more than a walk, etc.).
    Is that the fangraph formula or the SC one?

    Actually, I'll expand. Fangraphs uses a different wOBA formula than Statcorner. Which one is the better one in people's opinions? And why? Perhaps this isn't a simple question and warrants it's own thread.

    It does bring up the issue with Saber stuff. .BA is, well .BA. Everyone computes it the same way. The fact that wOBA fluctuates in the way it's acquired probably turns some people off to the concept.
    Last edited by Rylinkus; 06-22-2009 at 04:27 PM.

  11. #11
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    Quote Originally Posted by Zep View Post
    wOBA's actual formula looks like this in case you're ever bored and want to calculate for yourself:



    That is, (.72 x Non-Intentional Bases on balls + .75 x Hit-by-Pitch + .90 x Singles + .92 x Reached Base on Error + 1.24 x Doubles + 1.56 x Triples + 1.95 x Home Runs)/Total Plate appearances.

    wOBA (from my understanding) is basically OBP, but each specific event that leads to a batter reaching base is given a specific value, or weight (a triple is worth more than a double, a double is worth more than a walk, etc.).
    why doesn't wOBA take into account Intentional Base on balls... there's got to be a run probablity associate with it to.

    Quote Originally Posted by MrPoon
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  12. #12
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    Quote Originally Posted by Zep View Post
    wOBA's actual formula looks like this in case you're ever bored and want to calculate for yourself:



    That is, (.72 x Non-Intentional Bases on balls + .75 x Hit-by-Pitch + .90 x Singles + .92 x Reached Base on Error + 1.24 x Doubles + 1.56 x Triples + 1.95 x Home Runs)/Total Plate appearances.

    wOBA (from my understanding) is basically OBP, but each specific event that leads to a batter reaching base is given a specific value, or weight (a triple is worth more than a double, a double is worth more than a walk, etc.).
    I don't like the fact that reaching base by an error is factored into wOBA. Sure it correlates to run production, but it isn't a result of a person's skill. Why should someone get credit for reaching base on a ****** ground ball that goes through someone's legs?

  13. #13
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    Quote Originally Posted by Jilly Bohnson View Post
    Okay, so basically it goes like this. You know how stuff like a single, a double, a walk, and a homerun, etc. each have a run expectancy attached to them? That is, for example, a single is worth let's say half a run, meaning for every single that is hit it generally leads to half a run scored on average. Well what wOBA does, is it takes all of what a player did, all their singles, doubles, homers, etc., attaches their run expectancy for each of those events, and then multiplies them by certain mulitpliers that make wOBA on the same scale as OBP to make it easier to understand. So for example about .335 would be average, .350 would be pretty good, and .400 would f'ing awesome.
    ahhhh....got it. Thanks!

  14. #14
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    Quote Originally Posted by Jilly Bohnson View Post
    Okay, so basically it goes like this. You know how stuff like a single, a double, a walk, and a homerun, etc. each have a run expectancy attached to them? That is, for example, a single is worth let's say half a run, meaning for every single that is hit it generally leads to half a run scored on average. Well what wOBA does, is it takes all of what a player did, all their singles, doubles, homers, etc., attaches their run expectancy for each of those events, and then multiplies them by certain mulitpliers that make wOBA on the same scale as OBP to make it easier to understand. So for example about .335 would be average, .350 would be pretty good, and .400 would f'ing awesome.
    And run expectancy = move over value (slugging in a way) + get on-base value (OBP).

    It's context-neutral, meaning it doesn't take into account any type of situation. It's just the marginal value of the event given a neutral environment.

  15. #15
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    Quote Originally Posted by Seamhead View Post
    And run expectancy = move over value (slugging in a way) + get on-base value (OBP).

    It's context-neutral, meaning it doesn't take into account any type of situation. It's just the marginal value of the event given a neutral environment.
    Yeah, good point. Most run expectancy charts talk about the environment, so how many outs and runner on there are, but wOBA doesn't. That's an important distinction.


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