Classic study: Correlation between local stork population and local births.
-----Original Message----- From: Stu [mailto:[EMAIL PROTECTED]] Sent: Thursday, December 06, 2001 1:08 AM To: [EMAIL PROTECTED] Subject: Re: When does correlation imply causation? > My favorite original example is the correlation between number of > annual murders in a city and number of books in its libraries. > Students have no trouble seeing that the two are going to have a > fairly high correlation coefficient(*), but murders don't make > people read and books don't make people kill. There are many such examples. My favorites involve time series, for example, hat size and shoe size (birth to adult); hair length and weight (birth to age 1); and those with a third factor, for example, temperature and electric bill. Stu Garfield High School Los Angeles ================================================================= Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ ================================================================= ================================================================= Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =================================================================
