Comments on: Home team record in extra innings http://www.baseball-reference.com/blog/archives/155 This and that about baseball stats. Fri, 11 Nov 2011 16:57:02 +0000 hourly 1 http://wordpress.org/?v=3.3.2 By: Andy http://www.baseball-reference.com/blog/archives/155/comment-page-1#comment-171 Andy Mon, 06 Aug 2007 15:33:13 +0000 http://www.baseball-reference.com/sotd/archives/155#comment-171 Good thought, frankman. Using the PI, I searched 2000 to 2006, just set it to home game wins, then home game losses, games of 9 innings or less, summed by year. for home team wins: 2000 1211 Ind. Games 2001 1179 Ind. Games 2002 1199 Ind. Games 2003 1227 Ind. Games 2004 1184 Ind. Games 2005 1209 Ind. Games 2006 1222 Ind. Games And home team losses 2000 1015 Ind. Games 2001 1054 Ind. Games 2002 1026 Ind. Games 2003 1005 Ind. Games 2004 1026 Ind. Games 2005 1039 Ind. Games 2006 1022 Ind. Games Total home team wins = 8431 Total home team losses = 7187 That's a winning percentage of 0.540 for home teams in games of 9 innings or less. So, in actuality, home teams win extra inning games slightly less than games of regular length. I suppose that is basically a regression to the mean, so to speak. In other words, over the course of 9 innings, the home team tends to outscore the visiting team. But in any one inning (such as a decisive 10th inning), those larger trends are less apparent and the record drifts slightly more towards .500. Good thought, frankman.

Using the PI, I searched 2000 to 2006, just set it to home game wins, then home game losses, games of 9 innings or less, summed by year.

for home team wins:
2000 1211 Ind. Games
2001 1179 Ind. Games
2002 1199 Ind. Games
2003 1227 Ind. Games
2004 1184 Ind. Games
2005 1209 Ind. Games
2006 1222 Ind. Games

And home team losses
2000 1015 Ind. Games
2001 1054 Ind. Games
2002 1026 Ind. Games
2003 1005 Ind. Games
2004 1026 Ind. Games
2005 1039 Ind. Games
2006 1022 Ind. Games

Total home team wins = 8431
Total home team losses = 7187

That's a winning percentage of 0.540 for home teams in games of 9 innings or less. So, in actuality, home teams win extra inning games slightly less than games of regular length. I suppose that is basically a regression to the mean, so to speak. In other words, over the course of 9 innings, the home team tends to outscore the visiting team. But in any one inning (such as a decisive 10th inning), those larger trends are less apparent and the record drifts slightly more towards .500.

]]> By: frankman http://www.baseball-reference.com/blog/archives/155/comment-page-1#comment-170 frankman Mon, 06 Aug 2007 15:11:45 +0000 http://www.baseball-reference.com/sotd/archives/155#comment-170 What is the winning percentage of home teams in games that are 9 innings or less? This would be the number to compare with the .521 winning percentage. What is the winning percentage of home teams in games that are 9 innings or less? This would be the number to compare with the .521 winning percentage.

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