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Well of course its not 100%, because of the natural variability. A team can do well at home one year and not as well the next. The rate of differential is naturally variable.
But the important point is the overall trend. Sorry, but the idea that ALL of the better home percentage is due soley to teams constructing their teams for their home park strikes me as a gross overstatement.
If that were the case, I'd expect virtually all teams to do poorly on the road, since, as you claim, the teams are geared soley to their own parks. Given the rather large variety in park layout, particularly in earlier years, that would seem a natural consequence of your theory. The numbers however don't bear that out.
It's part of the reason, but by no means is it the only, or even primary, reason.
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