I pulled some data from espn.com:
Ratio of (HR/AB at home) to (HR/AB on the road), by offense, 2005-2007
Ratio of (HR/AB at home) to (HR/AB on the road), by defense, 2005-2007Code:Team Park 2005 2006 2007 Avg Rel. Avg. Baltimore Oriole Park at Camden Yards 102.7% 159.5% 143.7% 135.3% 125.2% Boston Fenway Park 91.8% 79.2% 93.1% 88.1% 81.5% LA Angels Angel Stadium of Anaheim 99.5% 80.0% 99.5% 93.0% 86.1% Chicago Sox US Cellular Field 146.0% 140.4% 144.8% 143.8% 133.1% Cleveland Jabobs Field 84.8% 98.5% 140.8% 108.0% 100.0% Detroit Comerica Park 115.3% 69.4% 133.4% 106.0% 98.1% Kansas City Kauffman Stadium 70.2% 112.2% 98.6% 93.7% 86.7% Milwaukee Miller Park 117.9% 121.0% 116.1% 118.3% 109.5% Minnesota Metrodome 105.4% 97.2% 71.3% 91.3% 84.5% NY Yankees Yankee Stadium 126.6% 121.7% 116.9% 121.7% 112.7% Oakland McAfee Coliseum 87.9% 97.5% 89.3% 91.6% 84.7% Seattle Safeco Field 95.6% 97.5% 106.9% 100.0% 92.6% Texas Rangers Ballpark in Arlington 150.2% 105.4% 117.2% 124.2% 115.0% Toronto Rogers Center 129.8% 157.0% 129.3% 138.7% 128.4% Atlanta Turner Field 96.9% 85.5% 95.6% 92.7% 85.8% Chicago Cubs Wrigley Field 108.1% 98.0% 127.7% 111.2% 103.0% Cincinnati Great American Ballpark 134.6% 139.8% 138.1% 137.5% 127.3% Houston Minute Maid Park 145.2% 138.0% 101.1% 128.1% 118.6% LA Dodgers Dodger Stadium 125.2% 143.4% 119.2% 129.3% 119.6% Washington RFK Stadium 71.9% 86.1% 67.1% 75.0% 69.4% NY Mets Shea Stadium 93.6% 97.1% 95.7% 95.5% 88.4% Philadelphia Citizens Bank Park 133.6% 115.0% 127.4% 125.3% 116.0% Pittsburgh PNC Park 76.3% 97.0% 82.0% 85.1% 78.8% St. Louis Busch Stadium 123.2% 89.2% 82.0% 98.1% 90.8% San Diego PETCO Park 76.1% 93.0% 80.8% 83.3% 77.1% San Francisco AT&T Park 107.1% 62.6% 71.8% 80.5% 74.5% Colorado Coors Field 129.3% 93.4% 152.5% 125.1% 115.8% Florida Dolphin Stadium 85.6% 92.4% 121.8% 100.0% 92.5% Arizona Chase Field 107.4% 119.9% 120.1% 115.8% 107.1% Tampa Bay Tropicana Field 85.8% 117.6% 112.0% 105.1% 97.3% Average 107.4% 104.5% 109.4% 107.1% 100.0%
For example looking at the Twins in 2005, the first table indicates Twin batters hit 1.057 HR/AB in the Metrodome for every HR/AB they hit on the road. Twins' pitchers gave up only .898 HR/AB in the dome for every HR/AB they allowed on the road. (Pitchers AB's were constructed from total bases allowed divided by slugging avg. against). Note the data tells you nothing about how many home runs a team hit or gave up in total, just how many at home versus on the road.Code:Team Park 2005 2006 2007 Average Rel. Avg. Baltimore Oriole Park at Camden Yards 90.2% 93.0% 100.0% 94.4% 99.9% Boston Fenway Park 89.0% 66.5% 80.0% 78.5% 83.1% LA Angels Angel Stadium of Anaheim 84.7% 80.2% 78.1% 81.0% 85.7% Chicago Sox US Cellular Field 138.3% 116.0% 100.6% 118.3% 125.2% Cleveland Jabobs Field 98.1% 79.3% 85.9% 87.8% 92.9% Detroit Comerica Park 74.9% 94.8% 97.5% 89.1% 94.3% Kansas City Kauffman Stadium 76.5% 87.5% 84.0% 82.6% 87.5% Milwaukee Miller Park 109.5% 84.7% 111.9% 102.1% 108.0% Minnesota Metrodome 89.8% 74.6% 75.7% 80.0% 84.7% NY Yankees Yankee Stadium 88.9% 98.9% 112.4% 100.1% 105.9% Oakland McAfee Coliseum 90.8% 75.3% 73.1% 79.8% 84.4% Seattle Safeco Field 71.3% 87.9% 96.6% 85.3% 90.3% Texas Rangers Ballpark in Arlington 96.1% 103.2% 81.4% 93.6% 99.0% Toronto Rogers Center 119.2% 96.8% 111.8% 109.3% 115.7% Atlanta Turner Field 77.7% 104.1% 103.6% 95.1% 100.7% Chicago Cubs Wrigley Field 99.7% 140.7% 97.6% 112.7% 119.2% Cincinnati Great American Ballpark 111.0% 118.2% 128.2% 119.1% 126.1% Houston Minute Maid Park 100.2% 101.2% 103.7% 101.7% 107.6% LA Dodgers Dodger Stadium 95.3% 103.2% 91.7% 96.7% 102.4% Washington RFK Stadium 87.8% 84.8% 68.0% 80.2% 84.9% NY Mets Shea Stadium 83.0% 79.7% 89.8% 84.2% 89.1% Philadelphia Citizens Bank Park 120.3% 130.6% 168.9% 140.0% 148.1% Pittsburgh PNC Park 92.0% 62.9% 75.9% 76.9% 81.4% St. Louis Busch Stadium 107.8% 86.2% 63.2% 85.7% 90.8% San Diego PETCO Park 76.8% 104.4% 60.6% 80.6% 85.3% San Francisco AT&T Park 81.5% 76.5% 83.7% 80.6% 85.3% Colorado Coors Field 84.0% 139.5% 93.2% 105.6% 111.8% Florida Dolphin Stadium 79.7% 86.8% 75.2% 80.5% 85.3% Arizona Chase Field 101.1% 146.2% 103.3% 116.8% 123.7% Tampa Bay Tropicana Field 88.4% 117.4% 83.4% 96.4% 102.0% Average 93.0% 95.7% 91.4% 93.4% 100.0%
The "average" column is just the three-year unweighted average, and the "relative avg" column is the team's three-year average divided by the total mlb three-year average.
I think St. Louis got a new park in 2006, so the 2005 numbers for them aren't too relevant. Looks like they may have gone from a hitters park to a pitchers park.
It looks like the strongest parks for hitters (concerning HRs only) are US Cellular (ChiSox); Rogers Center (Tor); Great American (Cin); and Citizens Bank (Phi). For pitchers, the best parks for HRs were: RFK (Was); AT&T (SF); PNC (Pit); and Fenway (Bos).
My goal was to determine if the data back up the idea that some parks are "hitter's parks" versus "pitcher's parks" and if so get some idea of how big the park effects are. There is a lot more volatility from season to seaon than I expected.
Some of the numbers are weird. Baltimore and Texas hit a lot more home runs at home than they do on the road, but their pitchers don't give up a lot more. Atlanta and the Cubs are just they opposite; they almost seem to have a home field disadvantage in terms of HRs. Colorado is just a mystery; I know they use the humidor, which is supposed to compensate for the elevation/dry air. I don't know how to interpret those numbers at all.
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