Monday, June 23, 2008

Do teams play worse after a time zone change? Part III

(UPDATE: This post was updated after I discovered my own analysis had three teams in the wrong time zones.)

In the last two posts, I reviewed reports of Dr. W. Christopher Winter's study on jet lag and baseball performance. The data suggested that the observed effect was just home field advantage.

In a comment to the second post, Dr. Winter said that most of the effect came from 2- and 3-hour time changes. So I reran the numbers, and considered only the first game where one team had 3-hour jet lag (from the day before), and the other team had none.

1997-2006 home winning percentage
----------------------------------
Home team jet-lagged: 14-19 (.424)
Road team jet-lagged: 72-46 (.610)


There's actually something here, although it's not statistically significant with the small sample of games.


Here are the breakdowns by decade:


2000-2007 home winning percentage
----------------------------------
Home team jet-lagged: 6-16 (.273)
Road team jet-lagged: 68-43 (.613)


1990-1999 home winning percentage
----------------------------------
Home team jet-lagged: 20-17 (.541)
Road team jet-lagged: 68-45 (.602)


1980-1989 home winning percentage
----------------------------------
Home team jet-lagged: 11-15 (.423)
Road team jet-lagged: 43-43 (.500)


1970-1979 home winning percentage
----------------------------------
Home team jet-lagged: 14-9 (.609)
Road team jet-lagged: 47-48 (.495)


None of these results looks statistically significant. The overall totals are:

1970-2007 home winning percentage
-----------------------------------
Home team jet-lagged: 51-57 (.472)
Road team jet-lagged: 226-179 (.558)

The effect goes in the right direction, but neither result is significantly different from .530. The difference between the two numbers is 86 points; that's about 1.5 SD from zero, which again is not statistically significant.



Labels: , ,

1 Comments:

At Thursday, January 01, 2009 6:05:00 AM, Blogger sexy said...

情趣用品,情趣用品,情趣用品,情趣用品,情趣用品,情趣用品,情趣,情趣,情趣,情趣,情趣,情趣,情趣用品,情趣用品,情趣,情趣,A片,A片,A片,A片,A片,A片,情趣用品,A片,情趣用品,A片,情趣用品,a片,情趣用品

A片,A片,AV女優,色情,成人,做愛,情色,AIO,視訊聊天室,SEX,聊天室,自拍,AV,情色,成人,情色,aio,sex,成人,情色

免費A片,美女視訊,情色交友,免費AV,色情網站,辣妹視訊,美女交友,色情影片,成人影片,成人網站,H漫,18成人,成人圖片,成人漫畫,情色網,日本A片,免費A片下載,性愛

色情A片,A片下載,色情遊戲,色情影片,色情聊天室,情色電影,免費視訊,免費視訊聊天,免費視訊聊天室,一葉情貼圖片區,情色視訊,免費成人影片,視訊交友,視訊聊天,言情小說,愛情小說,AV片,A漫,avdvd,情色論壇,視訊美女,AV成人網,情色文學,成人交友,成人電影,成人貼圖,成人小說,成人文章,成人圖片區,成人遊戲,愛情公寓,情色貼圖,成人論壇


免費A片,日本A片,A片下載,線上A片,成人電影,嘟嘟成人網,成人貼圖,成人交友,成人圖片,18成人,成人小說,成人圖片區,微風成人區,成人文章,成人影城

視訊聊天室,聊天室,視訊,,情色視訊,視訊交友,視訊交友90739,免費視訊,免費視訊聊天,視訊聊天,UT聊天室,聊天室,美女視訊,視訊交友網,豆豆聊天室,A片,尋夢園聊天室,色情聊天室,聊天室尋夢園,成人聊天室,中部人聊天室,一夜情聊天室,情色聊天室,080中部人聊天室,080聊天室,美女交友,辣妹視訊

 

Post a Comment

Links to this post:

Create a Link

<< Home