Ballpark-Adjusted Team Statistics For 2016

Note: I updated this file with a corrected calculation for ERA+ (March 18, 2017).

We have a complete record of game-by-game line scores for the 2016 season, and that enables me to compute comprehensive park factors for all teams.

The point of this exercise is to (1) highlight the ways in which various parks affect run scoring, and (2) to create Baseball-Reference-style index metrics, specifically OPS+ and ERA+.

Please see this page to learn more about how the calculations are made. Teams are sorted here in descending order of park factor, where 100 is average.

No	Team	Home R/G	Road R/G	Park Factor	Multiplier
1	Little Rock	9.68	8.43	115	1.074
2	Fighting Irish	9.46	8.27	114	1.072
3	Death Valley	9.99	8.78	114	1.069
4	Rosehill	8.74	7.78	112	1.062
5	St. Louis	7.25	6.57	110	1.052
6	West Side	10.36	9.47	109	1.047
7	Northwest	8.15	7.48	109	1.045
8	Miami	8.48	7.80	109	1.044
9	Brooklyn	8.28	7.73	107	1.036
10	Sudbury	9.16	8.74	105	1.024
11	Lake County	8.63	8.44	102	1.011
12	Northeast	8.53	8.77	97	0.987
13	Wilmingotn	8.59	8.95	96	0.980
14	Rochester	7.59	8.14	93	0.967
15	Elysian Fields	8.79	9.46	93	0.965
	Spokane	6.63	7.12	93	0.965
17	California	7.74	8.48	91	0.956
18	Mohawk Valley	7.77	9.22	84	0.921
19	Cape Cod	7.85	9.88	80	0.898
20	Goldenrod	6.65	8.81	75	0.877

Little Rock played as the most hitter-friendly park in the league with a factor of 115. This means that Scorpions home games featured 15 percent more runs than Scorpions in road games. At the other end of the spectrum, Goldenrod played in a park featuring a factor of 75, meaning that Gators home games saw 25 percent fewer runs than Gators road games.

Adjusted Batting Statistics

Here are the park-adjusted OPS+ leaders at the team level for the 2016 season, where OPS+ is figured in the same fashion as the old Total Baseball model. That figure is then adjusted by the park-factor multiplier to produce the Adjusted OPS+.

No	Team	Raw OPS+	Multiplier	Adjusted OPS+
1	Cape Cod	113	0.898	126
2	Goldenrod	109	0.877	124
3	Mohawk Valley	108	0.921	117
4	Elysian Fields	112	0.965	116
5	Death Valley	124	1.069	116
6	Lake County	111	1.011	110
7	Wilmington	103	0.980	105
8	Fighting Irish	105	1.072	98
9	West Side	103	1.047	98
10	Miami	100	1.044	96
11	Northeast	95	0.987	96
12	California	91	0.956	95
13	Rochester	90	0.967	94
14	Spokane	90	0.965	93
15	Rosehill	98	1.062	92
16	Sudbury	93	1.024	91
17	Brooklyn	94	1.036	91
18	St. Louis	91	1.052	86
19	Northwest	86	1.045	82
20	Little Rock	81	1.074	75

Adjusted Pitching Statistics

Now, let's apply the same principle to the pitching side of the ledger and adjust ERA+ by park-factor multipliers. Here's the team-level Adjusted ERA+ leaderboard for the 2016 season.

No	Team	Raw ERA+	Multiplier	Adjusted ERA+
1	St. Louis	125	1.052	129
2	Spokane	126	0.965	124
3	Goldenrod	126	0.877	116
4	Northwest	103	1.045	107
5	Miami	101	1.044	105
6	Death Valley	99	1.069	105
7	Brooklyn	101	1.036	105
8	Mohawk Valley	112	0.921	104
9	Rosehill	98	1.062	104
10	Lake County	100	1.011	101
11	Fighting Irish	94	1.072	101
12	Rochester	104	0.967	100
13	Elysian Fields	102	0.965	99
14	Wilmington	96	0.980	94
15	Cape Cod	104	0.898	93
16	California	98	0.956	93
17	Northeast	89	0.987	87
18	West Side	80	1.047	85
19	Sudbury	77	1.024	80
20	Little Rock	62	1.074	72