I ran the numbers through our park factor calculator today. Basically, the new parks come out as neutral. Citi get a 98/99 (batting/pitching) park factor and New Yankee gets a (98/97) park factor. Hyperventilation aside they are both very slight pitcher's parks. Whenever possible we use 3-year park factor which are an average of year N-1 and year N+1. When only two years are available we use year N-1 and year N and in the case of New Yankee and Citi we just use the current year. I also only use intra-league games since there is a home and home with every team in the league. Interestingly, if we include the inter-league games in our totals, we have only a percentage point change here or there.

I think we need to seriously rethink park factors and I've done a little bit of that, but don't have anything ready to use.

For now, I'm not going to tweak the park factors in the db. You should assume that Yankees and Mets hitters are slightly better than shown and the pitchers slightly worse, since I've been using 100/100 for the two parks.

Here are the 2009 3-year park factors if the season ended last night.

team_ID BPF_tot PPF_tot
ARI     109.000 109.000
COL     109.000 109.000
CHC     108.000 106.000
BOS     106.000 104.000
SFG     104.000 104.000
TEX     104.000 104.000
DET     103.000 104.000
PHI     103.000 101.000
CHW     103.000 103.000
CIN     102.000 103.000
TBR     102.000 102.000
LAA     101.000 100.000
FLA     101.000 101.000
BAL     99.000  101.000
HOU     99.000  99.000
MIN     99.000  98.000
ATL     99.000  99.000
STL     98.000  97.000
TOR     98.000  98.000
OAK     98.000  98.000
NYY     98.000  97.000
KCR     98.000  99.000
WSN     98.000  99.000
NYM     98.000  99.000
MIL     97.000  97.000
SEA     96.000  97.000
LAD     96.000  94.000
PIT     96.000  97.000
CLE     94.000  95.000
SDP     88.000  89.000