What is a earned pitcher run?

	POSITION	R	G	W	L	W%	GS	ERA	SO	CG	SHO	SV	IP	H	ER	HR	BB	HBP	GF	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Pitcher	2,070,867	1,222,684	228,864	228,558	.500	459,969	3.87	2,406,052	137,937	20,163	77,123	4098322.2	4,083,052	1,763,956	333,968	1,457,614	119,719	320,393	78,562	17,527,218	129,090	5.28	3.20	1.65	0.73	13.7	8.3	1.35	.284	4.55	100	3.87	100	8.97	674.9
2	Catcher	520	286	11	24	.314	22	6.78	115	14	0	5	518.2	758	391	82	155		250		2,519	25	2.00	2.69	0.74	1.42	4.6	6.2	1.76	.317	9.02	183	5.64	150	13.15	-112.3
3	First Baseman	1,789	531	91	134	.404	217	4.38	772	168	4	19	2370.2	2,805	1,154	93	788		271		10,736	116	2.93	2.99	0.98	0.35	7.2	7.3	1.52	.302	6.79	127	3.82	112	10.65	-116.3
4	Second Baseman	700	322	33	33	.500	59	5.43	271	50	2	8	896.0	1,131	541	87	318		243		4,119	40	2.72	3.19	0.85	0.87	6.6	7.7	1.62	.308	7.03	143	4.87	128	11.36	-110.4
5	Third Baseman	1,387	428	76	93	.450	161	4.05	518	140	4	8	1859.1	2,220	836	84	445		244		8,299	110	2.51	2.15	1.16	0.41	6.2	5.4	1.43	.296	6.71	123	3.79	116	10.75	-120.4
6	Shortstop	956	270	21	63	.250	82	4.97	330	66	2	5	1047.1	1,349	578	56	346		169		4,901	87	2.84	2.97	0.95	0.48	6.7	7.1	1.62	.312	8.22	147	4.13	119	11.59	-84.3
7	Left Fielder	12,794	2,584	851	1,015	.456	1,811	3.98	6,037	1,547	68	55	17315.1	19,352	7,658	482	5,255		683		77,206	1,307	3.14	2.73	1.15	0.25	7.8	6.8	1.42	.291	6.65	121	3.62	110	10.06	-637.8
8	Center Fielder	360	169	17	32	.347	49	4.78	209	25	3	2	557.1	610	296	32	273	29	100		2,499	30	3.38	4.41	0.77	0.52	8.4	10.9	1.58	.296	5.81	146	4.11	127	9.85	-62.3
9	Right Fielder	872	296	48	80	.375	128	4.54	481	89	7	3	1326.1	1,473	669	55	563	63	137		5,855	35	3.26	3.82	0.85	0.37	8.2	9.6	1.54	.302	5.92	143	3.80	123	10.00	-111.1
10	Pinch Hitter
11	Pinch Runner
12	Designated Hitter	203	118	39	19	.672	88	3.27	621	1	1	0	517.0	392	188	62	192	27	27	2	2,118	44	10.81	3.34	3.23	1.08	29.3	9.1	1.13	.271	3.53	77	3.59	84	6.82	37.3