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Re: st: finding a peak in an asymmetric curve


From   Yoshiro Nagao <dengue_aedes@yahoo.co.jp>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: finding a peak in an asymmetric curve
Date   Wed, 12 Apr 2006 08:53:03 +0900 (JST)

Dear Maarten, Ron, Joseph,

Thank you very much for the
useful commands and solutions.

I will learn how to do it
and try it.

> I'm not sure what the "significance" of a peak is,
> and I notice that  
> you have rather shyly surrounded it with quotes.
> What exactly do you  
> want to find out about the peak.

What I would like to show:

(1) whether the curve is really rising up and 
 fallind down, instead of monotonously 
 rising/falling.

(2) whether the "x" (not "y") for the peak
   is significantly different, 
   when there are two or more of such curves,

Indeed there are some mathematical models
but, when I tried to apply them by "nl",
they did not converge.

Yoshiro

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