from 2001 to 2008, shea stadium had an average park effect on homers of 0.870, based on the data on espn.com. this includes 2006 where shea had a jaw-droppingly low park factor of 0.575. excluding this from the data, shea had a park factor of 0.912. from 2009 until present, citi field has an aveage park effect on homers of 0.861, based on the same espn data. if you wish to discount the 2009 season wherein the park had a positive effect on homers to the tune of 1.057, this figure drops to 0.763. i don't know why you'd drop 40% of your data just because it doesn't agree with your preconceived notions, but whatever. if we're dropping data because it conflicts with our preconceived notions, then i suggest we also toss out shea's 2008 park effect of 1.081, which was likely inflated by citi's affect on the natural wind patterns. doing that, shea's average home run park effect is 0.884. oddly, (0.884-0.763)/0.884 = 13.68% i still come back to the notion that i want to look at the paths that batted balls took off of jason bay's bat in 2009 and compare them to the fences of citi field, to see just how many balls he should have expected to lose to the park. i'd like to also do the same to david wright's 2008. well, more correctly, i'd like for someone to do it for me. and then i'd like to tell them both to fuck off to hell for letting the goddamned fences un-make their careers over maybe four home runs each, at least half of which would probably still go for doubles.