Joe Girardi v. Pythag.

In his eight years managing the Yankees, Joe Girardi is plus 22 wins over the number projected by the Pythag equation:

What is pythagorean winning percentage?

Pythagorean winning percentage is an estimate of a team's winning percentage given their runs scored and runs allowed. Developed by Bill James, it can tell you when teams were a bit lucky or unlucky. It is calculate by

(Runs Scored)^1.83

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(Runs Scored)^1.83 + (Runs Allowed)^1.83

The traditional formula uses an exponent of two, but this has proven to be a little more accurate.

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Here are Girardi's numbers, not including today's game. Data is from baseball-reference.com.

				Pyth	Pyth
		W	L	W	L	Dif	Dif%	Fin
2006	Marlins	78	84	80	82	-2	-2.56%	4
2008	Yankees	89	73	87	75	2	2.25%	3
2009	Yankees	103	59	95	67	8	7.77%	1	WS
2010	Yankees	95	67	97	65	-2	-2.11%	2	ALCS
2011	Yankees	97	65	101	61	-4	-4.12%	1	ALDS
2012	Yankees	95	67	95	67	0	0.00%	1	ALCS
2013	Yankees	85	77	79	83	6	7.06%	3
2014	Yankees	84	78	77	85	7	8.33%	2
2015	Yankees	87	75	88	74	-1	-1.15%	2	WC
2016	Yankees	75	65	69	71	6	8.00%
	Yankees					22