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...you could legitimately question the validity of one-year (or even three-year-averaged) park factors...you know, Doc, that I have essentially zero faith in ratio park factors...I believe the correct approach is to view parks as adding or subtracting X number of runs per game per side...not some ratio of the number of runs per game per side, because the ratio approach assumes that the park's influence is dependent on the scoring context...which is a blatantly stupid assumption. Coors field's park dimensions and altitude, weather conditions etc are not going to have a different impact on run scoring as run scoring increases.