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Sunday, May 11

Relative Power Index

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2008 MLB RPI Rankings
RNK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	ExpW-L	ExpWP
1	Boston	.536	24	15	.615	.509	3	198	166	23-16	.587
2	Florida	.528	22	14	.611	.500	11	176	163	19-17	.538
3	Tampa Bay	.526	20	16	.556	.516	12	163	150	19-17	.541
4	Chicago Cubs	.521	21	15	.583	.501	9	205	154	23-13	.639
5	Arizona	.519	23	14	.622	.485	2	204	158	23-14	.625
6	NY Mets	.519	18	16	.529	.516	10	165	156	18-16	.528
7	Oakland	.518	22	16	.579	.497	1	175	139	23-15	.613
8	LA Angels	.513	22	16	.579	.492	6	173	170	19-19	.509
9	Milwaukee	.511	17	19	.472	.524	21	153	176	15-21	.430
10	St. Louis	.511	23	15	.605	.480	4	174	149	22-16	.577
11	Houston	.510	20	17	.541	.499	13	177	161	20-17	.547
12	Minnesota	.505	18	17	.514	.502	14	149	155	17-18	.480
13	Philadelphia	.504	21	17	.553	.488	7	182	171	20-18	.531
14	Baltimore	.500	19	18	.514	.496	19	153	160	18-19	.478
15	Cleveland	.499	18	18	.500	.499	17	161	138	21-15	.576
16	Chicago Sox	.499	18	17	.514	.493	16	162	139	20-15	.576
17	Pittsburgh	.498	17	19	.472	.507	20	179	196	16-20	.455
18	NY Yankees	.498	19	19	.500	.497	18	167	164	19-19	.509
19	LA Dodgers	.496	19	17	.528	.485	5	179	159	20-16	.559
20	Toronto	.495	17	21	.447	.511	15	145	150	18-20	.483
21	Washington	.493	15	22	.405	.523	22	144	188	14-23	.370
22	Cincinnati	.488	15	22	.405	.516	26	159	183	16-21	.430
23	Texas	.487	18	20	.474	.492	23	173	199	16-22	.430
24	Atlanta	.485	18	17	.514	.475	8	173	132	22-13	.632
25	Detroit	.482	16	22	.421	.503	24	180	209	16-22	.426
26	Colorado	.479	15	22	.405	.503	28	163	192	15-22	.419
27	San Francisco	.475	15	22	.405	.499	29	129	174	13-24	.355
28	Kansas City	.473	15	21	.417	.492	25	129	163	14-22	.385
29	Seattle	.467	14	24	.368	.500	27	147	173	16-22	.419
30	San Diego	.462	13	24	.351	.498	30	122	172	12-25	.335

Glossary
W: Wins, L: Losses, PCT: Winning percentage, RPI: Relative Power Index+, SOS: Strength of schedule , PWR: ESPN Power Ranking , RS: Runs scored, RA: Runs allowed, ExW-L: Expected W-L*, ExWP: Expected winning percentage*

+The basic formula is 25% team winning percentage, 50% opponents' average winning percentage, and 25% opponents' opponents' average winning percentage.

*ExW-L and ExWP are derived from Bill James' Pythagorean theorem of baseball: Runs scored [squared] / (Runs scored [squared] + runs allowed [squared]). This formula was designed to relate a team's runs scored and runs allowed to its won-lost record.