Fair Ball! Phillies' Citizens Bank Park Still Playing Neutral (i.e. it's NOT a Hitter's Park)

Citizens Bank Park -- still the fairest in the land. (Photo by Jim McIsaac/Getty Images)

This is an update to this post from the end of last season: The Phillies' Home: Fairest in the Land.

2008 - 2010

In summary, that article reviewed Park Factors (explained below) for all MLB stadiums for the 3-year period 2008-2010.  It found that contrary to its reputation, and in spite of relatively short dimensions, Citizens Bank Park was one of the most neutral parks in baseball, both for overall scoring, and home runs in particular:

Scoring HRs
  PF RANK   PF RANK
PHI 1.015 12  1.042  12 

i.e. CBP boosted scoring by 1.5% (11 parks boosted scoring more), and it boosted HRs by 4.2% (11 parks were more homer-friendly).

The money quote:

... the bottom line is there are essentially no more runs scored, and no more home runs hit, in the Phillies' home games than there are in their away games. 

Explanation of Park Factors from the Maple Street Press 2011 Phillies Annual:

Park Factors are calculated by comparing stats in a team's home games with stats in that team's away games, against the same opponents, in order to control for team-by-team differences.  A number higher than 1.0 indicates a hitter's park, while lower than 1.0 is a pitcher's park -- a park factor of 1.1 indicates the stadium increases offense by 10%.

This Season

In the first half of 2011, the results have been very similar to the past 3 years.   CBP is squarely in the middle, suppressing scoring slightly while being almost exactly neutral in terms of boosting or suppressing home runs:

Scoring HRs
  PF RANK   PF RANK
PHI 0.962 17  1.002  16 


(more after the jump) 

2008 Through 2011 ASB

Adding the data from the first half of 2011 to the 2008-2010 results gives us these Park Factors for 2008-2011:

Scoring HRs Scoring HRs
  PF RANK   PF RANK   PF RANK   PF RANK
COL 1.272 1 1.249 4 ATL 0.993 16 0.984 14
TEX 1.150 2 1.259 3 WAS 0.993 17 0.982 15
ARI 1.126 3 1.092 9 SF 0.971 18 0.891 19
CHC 1.101 4 1.089 10 MIL 0.970 19 1.057 11
BOS 1.099 5 0.889 21 PIT 0.963 20   0.849 24
CHW 1.085 6   1.342 1     OAK 0.962 21 0.874 23
BAL 1.060 7 1.234 5 HOU 0.959 22 1.123 8
NYY 1.054 8 1.294 2 CLE 0.947 23 0.882 22
CIN 1.031 9 1.191 6 LAA 0.944 24 0.946 16
FLA 1.029 10   0.911 17     NYM 0.918 25 0.845 25
TOR 1.011 11 1.129 7 STL 0.912 26   0.805 27
DET 1.009 12 0.995 13 SEA 0.904 27 0.835 26
MIN 1.007 13 0.746 30 TAM 0.894 28 0.897 18
PHI 1.005 14 1.032 12 LAD 0.860 29 0.890 20
KC 1.001 15   0.794 28 SD 0.806 30 0.775 29

Note: NYM and NYY are for 2009-2011 only; MIN is for 2010-2011 only

and the same data, graphically (click to enlarge):

Fairestjul11_medium
The teams clustered under DET in the middle are ATL and WAS.

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