Quote:
Originally Posted by Ceej
File has been updated with 1876-'80, 1884, 1902 and 1905.
Numbers are a bit wild for the 1870s due to few teams, short schedules and franchises coming and going (the league ITPHR rate dropped from 59% in 1877 to 27% in '78, in large part due to Louisville dropping out). But in the 1880s and '90s it's looking like the ITPHR rate was around the 13-18% mark, to put some of the player career figures in post #33 in a bit more perspective.
And then the rate jumps to around 45-50% in the 1900s - this is what I've found for both 1902 and '05 so I don't think it's just me at this point. I plan to do some later decades next to find out more trends over time and get some ITPHR rates for more classic old ballparks.
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I'm interested in how some of these rates changed due to park effects. As I previously mentioned, the obvious example is Chicago in 1884 with their tiny, tiny park. That year Chicago and their opponents accounted for 70% of the 8-team National League's home runs, and because of the park almost all of those were in Chicago and over-the-fence.
For example, Silver Flint hit 21 career homers in over a 10-year career. 9 of them were in Lakefront Park in 1884.
Cap Anson had over 10,000 plate appearances spanning 27 years, but 21% of his 97 career homers came at home in 1884 in a few hundred PAs.
Ned Williamson had 64 career homers, 25 of them at home in 1884.
So I'd expect Lakefront Park to have a HR park factor of something like 800 or 1000 (with 100 being average), and an ISTP percentage of 0.5%. The rest of the league would average a HR park effect of 60, with an ISTP percentage of 30%. (All numbers made up for illustration, but still a decent swag.)