Editing Runs created (section)

==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