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'''Runs created (RC)''' is a [[baseball statistics|baseball statistic]] invented by [[Bill James]] to estimate the number of runs a hitter contributes to his team.
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==Purpose==
James explains in his book, ''[[The Bill James Historical Baseball Abstract]]'', why he believes runs created is an essential thing to measure:<blockquote>With regard to an offensive player, the first key question is how many ''runs'' have resulted from what he has done with the bat and on the basepaths. [[Willie McCovey]] hit .270 in his career, with 353 doubles, 46 triples, 521 home runs and 1,345 walks -- but his job was not to hit doubles, nor to hit singles, nor to hit triples, nor to draw walks or even hit home runs, but rather to put runs on the scoreboard.  How many runs resulted from all of these things?<ref>James, Bill (1985). ''The Bill James Historical Baseball Abstract'' (1st ed.), pp. 273-4. Villard. ISBN 0-394-53713-0</ref></blockquote>
 
Runs created attempts to answer this bedrock question.  The conceptual framework of the "runs created" stat is:
 
<math>RC = \frac{A\;\times\;B}{C}</math>
 
where
 
*A = On-base factor
*B = Advancement factor
*C = Opportunity factor
 
==Formula==
===Basic runs created===
 
In the most basic runs created formula:
 
<math>RC = \frac{(H+BB) \times TB}{AB+BB}</math>
 
where H is [[hit (baseball)|hits]], BB is [[base on balls]], TB is [[total bases]] and AB is [[at bat|at-bats]].
 
This can also be expressed as
 
:OBP &times; SLG &times; AB
:or,
:OBP &times; TB
 
where OBP is [[on-base percentage]], SLG is [[slugging average]], AB is [[at bat|at-bats]] and TB is [[total bases]].
 
==="Stolen base" version of runs created===
 
This formula expands on the basic formula by accounting for a player's basestealing ability.
 
<math>RC = \frac{(H+BB-CS) \times (TB+(.55 \times SB))}{AB+BB}</math>
 
where H is [[Hit_(baseball)|hits]], BB is [[base on balls]], CS is [[caught stealing]], TB is [[total bases]], SB is [[stolen base]]s, and AB is [[at bat]]s.
 
==="Technical" version of runs created===
 
This formula accounts for all basic, easily available offensive statistics.  
 
<math>RC = \frac{(H+BB-CS+HBP-GIDP) \times (TB+(.26 \times (BB - IBB + HBP)) + (.52 \times (SH + SF + SB)))}{AB+BB+HBP+SH+SF}</math>
 
where H is [[Hit_(baseball)|hits]], BB is [[base on balls]], CS is [[caught stealing]], HBP is [[hit by pitch]], GIDP is [[grounded into double play]], TB is [[total bases]], IBB is [[intentional base on balls]], SH is [[sacrifice hit]], SF is [[sacrifice fly]], and AB is [[at bat]]s.
 
===2002 version of runs created===
 
Earlier versions of runs created overestimated the number of runs created by players with extremely high A and B factors (on-base and slugging), such as [[Babe Ruth]], [[Ted Williams]] and [[Barry Bonds]]. This is because these formulas placed a player in an offensive context of players equal to himself; it is as if the player is assumed to be on base for himself when he hits home runs.  Of course, this is impossible, and in reality, a great player is interacting with offensive players whose contributions are inferior to his. The 2002 version corrects this by placing the player in the context of his real-life team. This 2002 version also takes into account performance in "clutch" situations.
 
:A: <math>H + BB - CS + HBP - GIDP</math>
:B: <math>(1.125 \times Singles) + (1.69 \times Doubles) + (3.02 \times Triples) + (3.73 \times HR) + .29 \times (BB - IBB + HBP) + .492 \times (SH + SF + SB) - (.04 \times K)</math>
:C: <math>AB + BB + HBP + SH + SF</math>
 
where K is [[strikeout]].
 
The initial individual runs created estimate is then:
 
<math>RC = \left ( \frac{(2.4C+A)\;(3C+B)}{9C} \right ) - .9C</math>
 
If situational hitting information is available, the following should be added to the above total:
 
<math>H_{RISP} - (AB_{RISP} \times BA) + HR_{ROB} - \frac{AB_{ROB} \times HR}{AB}</math>
 
where RISP is [[baserunning|runners in scoring position]], BA is [[batting average]], HR is [[home run]], and ROB is runners on base. The subscripts indicate the required condition for the formula. For example, <math>H_{RISP}</math> means "hits while runners are in scoring position."
 
This is then figured for every member of the team, and an estimate of total team runs scored is added up.  The actual total of team runs scored is then divided by the estimated total team runs scored, yielding a ratio of real to estimated team runs scored.  The above individual runs created estimate is then multiplied by this ratio, to yield a runs created estimate for the individual.<ref>James, Bill and Baseball Info Solutions (2007). ''The Bill James Handbook 2008'', pp. 475-7. ACTA Sports. ISBN 978-0-87946-340-3</ref>
 
===Other expressions of runs created===
 
The same information provided by runs created can be expressed as a rate stat, rather than a raw number of runs contributed. This is usually expressed as runs created per some number of outs, e.g. <math>\frac{RC}{27}</math> (27 of course being the number of [[Out (baseball)|outs]] per team in a standard 9-[[inning]] baseball game).
 
==Accuracy==
 
Runs created is believed to be an accurate measure of an individual's offensive contribution because when used on whole teams, the formula normally closely approximates how many runs the team actually scores.  Even the basic version of runs created usually predicts a team's run total within a 5% margin of error.<ref>James, Bill (2002).  ''Win Shares'', p. 90.  STATS, Inc. Publishing.  ISBN 1-931584-03-6</ref>  Other, more advanced versions are even more accurate.
 
==Related statistics==
 
* [[Win shares|Win Shares]] is James' attempt to summarize, in one stat, a player's contributions on both offense and defense.
 
==See also==
 
* [[Sabermetrics]]
* [[Base Runs]]
* [[Extrapolated Runs]]
* [[Runs produced]]
 
==External links==
*[http://baseball-reference.com/leaders/RC_career.shtml Career leaders in Runs Created]
*[http://baseball-reference.com/leaders/RC_season.shtml Single-season leaders in Runs Created]
*[http://baseball-reference.com/leaders/RC_active.shtml Runs Created leaders among active players]
*[http://baseball-reference.com/leaders/RC_leagues.shtml Year-by-year leaders in Runs Created]
 
==References==
{{reflist}}
 
{{Baseball statistics}}
 
[[Category:Batting statistics]]

Latest revision as of 11:30, 14 December 2014

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