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terpsfan101 · 03-08-2010, 01:20 AM

Well, the spreadsheet Gambo uses to calculate his park factors wasn't created by him. I tried to tweak some of the formulas, but I really don't know what the heck I'm doing. To get the homerun PF higher for the Polo Grounds, I weighted the dimensions down the lines more heavily. To lower the doubles PF, I substituted the triples PF. For the record, I am all for combining doubles and triples into one park factor, especially when working with real park data. Anyway, I like the idea of calculating a theoretical park factor from dimensions, altitude, etc... I am just not a fan of the spreadsheet Gambo uses to accomplish this.

In fact, the ideal way to calculate park factors is to calculate a theoretical park factor first using dimensions, fence heights, altiude, weather, and then regress the actual park factor to the theoretical park factor. Obviously this is a lot of work that I don't feel like doing, so I just regress all my park factors to 1. For instance, I should probably regress my park factors for Coors Field to something like 1.15, Petco to approximately .85. In it's brief existence so far, Petco has depressed run-scoring more than any other park in baseball history. Even more than Braves Field of the late 1930's and Dodger Stadium in the mid to late 1960's.

03-08-2010, 01:20 AM	#5
terpsfan101 Minors (Rookie Ball) Join Date: Feb 2010 Posts: 31	Well, the spreadsheet Gambo uses to calculate his park factors wasn't created by him. I tried to tweak some of the formulas, but I really don't know what the heck I'm doing. To get the homerun PF higher for the Polo Grounds, I weighted the dimensions down the lines more heavily. To lower the doubles PF, I substituted the triples PF. For the record, I am all for combining doubles and triples into one park factor, especially when working with real park data. Anyway, I like the idea of calculating a theoretical park factor from dimensions, altitude, etc... I am just not a fan of the spreadsheet Gambo uses to accomplish this. In fact, the ideal way to calculate park factors is to calculate a theoretical park factor first using dimensions, fence heights, altiude, weather, and then regress the actual park factor to the theoretical park factor. Obviously this is a lot of work that I don't feel like doing, so I just regress all my park factors to 1. For instance, I should probably regress my park factors for Coors Field to something like 1.15, Petco to approximately .85. In it's brief existence so far, Petco has depressed run-scoring more than any other park in baseball history. Even more than Braves Field of the late 1930's and Dodger Stadium in the mid to late 1960's.