How Is Vegas Doing On Park Factors?

Below is a table showing each teams actual park factor (runs) and the Vegas park factor which is calculated by reverse engineering their over/unders for each game and using that as a proxy for actual runs scored for each game. The table is sorted by which actual park factor is closest to the Vegas park factor. The teams at the top of the list are playing in a run environment at home close to where the betting public is predicting it to be. The teams at the bottom of the list are having a lot of random variation when it comes to their home park run environment so far in this young season. Small sample sizes and regression to the mean are at play here but it is interesting to see how things are shaping up so far with the empirical data.

Team	Actual PF	Vegas PF	Delta
Dodgers	0.992	0.998	0.005
Reds	1.118	1.082	0.036
Padres	0.945	0.908	0.037
Twins	0.941	0.978	0.037
Mets	0.791	0.847	0.056
Rangers	1.009	1.065	0.056
DBacks	1.013	1.071	0.058
Braves	0.922	0.981	0.059
White Sox	1.035	0.962	0.073
Phillies	0.827	0.910	0.083
Marlins	1.136	1.034	0.103
Giants	0.849	0.951	0.103
A's	0.783	0.888	0.106
Indians	0.907	1.014	0.106
Blue Jays	1.219	1.103	0.116
Tigers	0.930	1.060	0.130
Pirates	1.047	0.912	0.136
Rockies	1.473	1.321	0.152
Yankees	0.872	1.037	0.165
Cubs	1.167	0.993	0.174
Mariners	0.738	0.931	0.192
Rays	1.123	0.927	0.195
Nats	0.773	0.988	0.215
Red Sox	1.248	1.021	0.227
Royals	1.285	1.052	0.233
Astros	1.261	1.020	0.241
Angels	1.253	0.964	0.288
Orioles	0.694	1.017	0.324
Brewers	0.667	1.056	0.388
Cardinals	1.375	0.974	0.402