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Friday, September 5

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	Tampa Bay	.540	84	53	.613	.516	2	643	554	79-58	.574
2	Boston	.533	82	57	.590	.514	5	734	584	85-54	.612
3	LA Angels	.532	84	54	.609	.506	7	639	582	75-63	.547
4	Chicago Cubs	.523	85	55	.607	.494	1	750	570	89-51	.634
5	Chicago Sox	.522	78	61	.561	.509	4	700	613	79-60	.566
6	NY Yankees	.521	75	64	.540	.514	11	679	634	74-65	.534
7	Milwaukee	.518	80	59	.576	.498	3	665	586	78-61	.563
8	Minnesota	.517	77	62	.554	.504	10	707	628	78-61	.559
9	Toronto	.516	72	66	.522	.514	13	608	535	78-60	.564
10	Houston	.512	74	66	.529	.506	15	628	653	67-73	.480
11	NY Mets	.507	79	61	.564	.488	8	693	606	79-61	.567
12	St. Louis	.506	75	65	.536	.496	9	676	625	75-65	.539
13	Philadelphia	.504	76	64	.543	.491	6	676	585	80-60	.572
14	Texas	.501	69	72	.489	.505	19	769	836	65-76	.458
15	Baltimore	.501	63	76	.453	.517	22	708	744	66-73	.475
16	Cleveland	.498	67	71	.486	.503	12	671	633	73-65	.529
17	Oakland	.497	63	75	.457	.511	21	533	574	64-74	.463
18	Detroit	.496	67	72	.482	.501	17	704	709	69-70	.496
19	LA Dodgers	.493	70	70	.500	.491	23	584	572	71-69	.510
20	Florida	.493	71	69	.507	.489	16	652	684	67-73	.476
21	Arizona	.490	71	68	.511	.483	14	638	612	72-67	.521
22	Kansas City	.488	58	79	.423	.510	30	562	686	55-82	.402
23	Pittsburgh	.485	59	79	.428	.504	28	624	759	56-82	.403
24	Cincinnati	.482	61	78	.439	.497	25	593	692	59-80	.423
25	Colorado	.479	66	75	.468	.483	18	658	717	64-77	.457
26	Atlanta	.475	60	80	.429	.490	24	642	674	67-73	.476
27	Seattle	.474	54	85	.388	.503	26	581	691	58-81	.414
28	San Francisco	.472	60	79	.432	.486	20	539	651	57-82	.407
29	Washington	.467	54	86	.386	.494	27	544	693	53-87	.381
30	San Diego	.460	53	86	.381	.486	29	537	655	56-83	.402

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.