Last night I heard a little grumbling about the Indians-Astros game getting called early. The Indians, the home team, won 2-1 in a 7 inning game. I decided to got back and see if the umpires were more likely to call a game with the home team winning vice losing.
I found there to be 269 games called early over the past 30 years. The home team won 143 times for a winning percentage of 53.2%. Historically, the home team wins 54% of the time, so no bias exists in calling the game.
Since I had the data available, I went ahead and plotted the number of games called early along with a three year average.
The number of games dipped in the mid-80′s and has been slowly rising since then.