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Re: st: Fwd: false positives


From   "Moises Rosas (w)" <morofe210-statalist@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Fwd: false positives
Date   Sun, 20 Sep 2009 10:51:06 -0700 (PDT)

The best I have ever seen :)




________________________________
From: Kit Baum <baum@bc.edu>
To: statalist@hsphsun2.harvard.edu
Sent: Sunday, September 20, 2009 7:23:47 AM
Subject: st: Fwd: false positives


Begin forwarded message:

> From: Arthur Lewbel <lewbel@bc.edu>
> Date: September 19, 2009 9:57:57 AM EDT
> To: ecFaculty@fmwww.bc.edu
> Subject: false positives
> 
> Faculty,
> 
> I just came across a wonderful illustration of the problem that if you estimate too many parameters, some will be significant just by random chance. This is the link to a poster that was presented at the 15th annual conference of the organization of human brain mapping:  http://prefrontal.org/files/posters/Bennett-Salmon-2009.pdf
> 
> In this study, the authors put a Salmon in an MRI machine. They showed the fish pictures of human faces, and recorded the responses in thousands of tiny areas within its brain. A small number of statistically significance responses (p value less than .001) were found. What's most amazing is that the fish was dead at the time.
> 
> Arthur
> 
> =================================================+
> Arthur Lewbel  lewbel@bc.edu    http://www2.bc.edu/~lewbel/
> phone: (617)-552-3678  fax: (617)-552-2308
> Dept. of Economics, Boston College, Chestnut Hill, MA 02467, USA
> ==================================================
> 


Kit Baum  |  Boston College Economics & DIW Berlin  |  http://ideas.repec.org/e/pba1.html
                              An Introduction to Stata Programming  |  http://www.stata-press.com/books/isp.html
  An Introduction to Modern Econometrics Using Stata  |  http://www.stata-press.com/books/imeus.html

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