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Stats Encyclopedia
Topic Started: Fri Mar 13, 2009 11:46 pm (58 Views)
Deleted User
Deleted User

I'm pulling some of these definitions from Baseball Almanac, and others that I leave off please feel free to post and I'll add them to the main post.

OFFENSIVE

Adjusted Production [APRO or PRO]
(On Base Percentage divided by League OBP) + (Slugging Average divided by League SA) -1
The adjusted production statistic is a park and league adjusted version of on base plus slugging percentage. It is specifically used and created by Total Baseball for comparison of players from different eras in different parks. This is an advanced statistic which requires the complete understanding of on base percentage, slugging average and a park adjustment factor. Total Baseball has adjusted OBP and SA for the player's home park and League OBP and League SA are the league average for each statistic respectively. As in OPS, the decimal point is dropped when APRO in seen or used.

Batting Average (BA or AVG)
Hits / At Bats
Simply the percentage of at bats in which a player reaches base with a hit.

Batting Average on Balls In Play (BABIP)
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BABIP is commonly used as a red flag in sabermetric analysis, as a consistently high or low BABIP is hard to maintain - much more so for pitchers than hitters. Therefore, BABIP can be used to spot fluky seasons by players.

Equivalent Average (EqA)

H + TB + 1.5*(BB + HBP) + SB
EqA = ----------------------------
AB + BB + HBP + CS + SB/3

According to Baseball Prospectus: Simply put, it's more accurate, it's unbiased, and it models the scale of batting average, so it's easy for a new fan to understand.


Isolated Power [ISO]
Total Bases - Hits (divided by) At Bats
Isolated Power, or extra-bases per at bats, was also invented by Branch Rickey and All Roth during the 1950's. On Base Percentage measured for the manager how often a player reaches base while the isolated power showed them how often those bases reached were extra base hits - beyond a single. The total bases here was calculated by awarding 0 for a single, 1 for a double, 2 for a triple and 3 for a home run.

On Base Percentage (OBP)
(Hits + Walks + Hit-By-Pitch) divided by (At Bats + Walks+ Hit-By-Pitch + Sac Flys)
How often a player reaches base.

On Base Plus Slugging (OPS)
On Base Percentage + Slugging Average
This is not a true statistic by definition but it is often used as an index for rating an overall player's performance and production versus his fellow players.

Runs Created [RC]
There are many versions of this stat, some of them are as follows:

Bill James original version:
On Base Percentage x Total Bases
This statistic was originally created by Bill James to measure a player's total offensive production. By combining the two statistical (OBP and TB which are listed on this page) results you can determine that desired production. Bill James describes it by saying scoring runs consists of two actions: First - getting on base or creating baserunners (which is on base percentage) and Second - the advancing of those runners around the bases (which is total bases). A superb stat that creates a great index for offensive ratings.

"Basic Runs Created"
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"Stolen Base Version"
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"Technical Version"
[img]
http://upload.wikimedia.org/math/9/8/b/98bc528ce261f60c3efcf6a4a5b3d9c3.png[/img]

"2002 Version"

Spoiler: show
A: H + BB − CS + HBP − GIDP
B: (1.125 \times Singles) + (1.69 \times Doubles) + (3.02 \times Triples) + (3.73 \times HR) + .29 \times (BB - IW + HBP) + .492 \times (SH + SF + SB) - (.04 \times K)
C: AB + BB + HBP + SH + SF

The initial individual runs created estimate is then:
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If situational hitting information is available, the following should be added to the above total:
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Runs Created Per 25 [RC]
Runs Created (divided by) Number of Outs x 25
This statistic was also created by Bill James and uses the results of the runs created formula listed above. You then divide by the number of outs the player actually made and multiply it by 25. The figure is an estimate of how many runs a team made of.

Slugging Average/Percentage (SLG or SA)
Number of (Singles + [2 x Doubles] +[ 3 x Triples] + [4 x Home Runs]) divided by At Bats
A players Slugging Average, or Slugging Percentage, is directly defined as total bases per at-bat. To calculate a player's total bases you award a 1 for a single, a 2 for a double, a 3 for a triple, and a 4 for a home run then add them all together. Divide that by the total number of at bats a player has and you can easily determine the overall number of bases a player generally touches during his at bats.

Stolen Base Runs [SBR]
(.3 x Stolen Bases) - (.6 x Caught Stealing)
This is another very good Total Baseball statistic aimed at quantifying base-stealing. Numerous statistical studies done by Total Baseball have shown that the break even success rate for steals (the rate at which an attempt to steal is neither helping nor hurting the team in terms of total runs scored) is about 67%. Each successful steal adds approximately .3 runs to a team's total runs scored which is much less than often believed. Therefore, the statistic is meant to estimate the impact of base-stealers, which, other than the elite base-stealers, rarely amounts to more than a few runs per year for each team.

Total Bases [TB]
Number of (Singles + [2 x Doubles] +[ 3 x Triples] + [4 x Home Runs])
When calculating batting average, every hit simply counts as one. Total bases places a "weight" on each base hit and according to The Baseball Dictionary "computes his worth as a batter."

DEFENSIVE

Fielding Average
(Putouts + Assists) divided by (Putouts + Assists + Errors)
The fielding average, or fielding percentage, defensive statistic is the most common rating system being used in baseball today. It is meant to measure the success rate of fielding opportunities by each player.

Range Factor [RF]
(Putouts + Assists) x 9 divided by Defensive Innings Played
Range Factor simply stated is the number of plays MADE per game at the fielding position.

Ultimate Zone Rating (UZR)
The number of runs above or below average a fielder is in both range runs and error runs combined.

Zone Rating (ZR)
Plays Made by fielder (divided by) How many were hit into his zone
How many plays a fielder makes, and how many were hit into his zone. You divide the first number by the second, and you have zone rating. You can look at how many plays were made compared to an average fielder to get a plus minus rating, and that can easily be converted to runs to help us measure the overall worth of a ballplayer.

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PITCHING

Adjusted Pitching Runs [APR or PR/A]
(Innings Pitched divided by 9) x (League ERA - ERA)
An advanced pitching statistic used to measure the number of runs a pitcher prevents from scoring compared to the league's average pitcher in a neutral park in the same amount of innings.

Earned Run Average [ERA]
(Number of Earned Runs x 9) divided by (Number of Innings Pitched)
Earned Runs per nine innings pitched.

Earned Run Average Plus [ERA+ or RA]
League ERA (divided by) ERA
This statistic uses a league normalized earned run average in the calculation and is meant to measure how well the pitcher prevented runs from scoring relative to the rest of the league.

Game Score
Start with 50 points. Add 1 point for each out recorded, (3 points per inning). Add 2 points for each inning completed after the 4th. Add 1 point for each strikeout. Subtract 2 points for each hit allowed. Subtract 4 points for each earned run allowed. Subtract 2 points for each unearned run allowed. Subtract 1 point for each walk.
An advanced pitching statistic developed by Bill James used to measure how dominant a pitcher performed in each game he pitched

Opposing Team's Batting Average
Number Of Allowed Hits (divided by) (Batters Faced - Walks - Hit Batsmen - Sacrifice Hits - Sacrifice Flies - Catcher's Interference)
The primary purpose for this measurement is to gauge the opposing team's batting average when facing this particular pitcher in the game currently being pitched.

Walks And Hits per Innings Pitched [WHIP]
(Hits + Walks) divided by Innings Pitched
Developed to measure the approximate numbers of walks and hits a pitcher allows in each inning he pitches then compares the value received to other pitchers to formulate a pitcher's index.
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Deleted User
Deleted User

Wins
How to judge a pitcher
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Deleted User
Deleted User

RBIs
How to judge a hitter
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SL


This thread:

Not necessary and redundant.....


http://www.tangotiger.net/wiki/index.php?title=Main_Page
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Deleted User
Deleted User

This thread is very necessary.
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Deleted User
Deleted User

LupEND
Sat Mar 14, 2009 12:19 am
This thread:

Not necessary and redundant.....


http://www.tangotiger.net/wiki/index.php?title=Main_Page
To who? You? The thread wasn't for you.

Get the stick out of your ass... :whistle: :thumbsup: :drink:
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Deleted User
Deleted User

LupEND
Sat Mar 14, 2009 12:19 am
This thread:

Not necessary and redundant.....


http://www.tangotiger.net/wiki/index.php?title=Main_Page
The only thing not necessary in my thread is your effortless, arrogant, and simplistic post. :freakysmile:
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SL


An incredibly hard to read thread with a bevy of obsolete stats, especially when there are a ton of sites that have great, easy to read definitions, like the one I linked is very redundant.
Edited by SL, Sat Mar 14, 2009 12:31 am.
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SL


ShockerWichita
Sat Mar 14, 2009 12:30 am
LupEND
Sat Mar 14, 2009 12:19 am
This thread:

Not necessary and redundant.....


http://www.tangotiger.net/wiki/index.php?title=Main_Page
The only thing not necessary in my thread is your effortless, arrogant, and simplistic post. :freakysmile:
Save yourself some time and bookmark the page I linked.
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Deleted User
Deleted User

Everyone has their choice what to read and what not to read. No official is needed.
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