R help - Sep 2004 - exponential correlation?

Hello,
	I have been asked to perform a exponential correlation on a data set.
Unfortunately, i did not find any simple example on how to do that with R. 
If the correlation is significant, one asked me to also find the thresold 
of the acceleration slope.

Have any of you a little example or a good link to get me started?

Best regards

Blaise
-- 
Mutt, c'est de la balle, quand ??a marche :-)

The "nlme" package has "corExp" for estimating the nuggett
effect
n and the range d for an exponential spatial correlation structure = n + 
(1-n)*exp(-r/d), where r = distance between two observations.  See 
library(nlme);  ?corExp, plus Pinheiro and Bates (2000) Mixed-Effects 
Models for S and S-Plus (Springer). 

      Is this what you want? 

      hope this helps. 
      spencer graves
p.s.  If this is NOT adequate, please read the posting guide! 
"http://www.R-project.org/posting-guide.html".  This might help you 
answer some questions for yourself, thereby getting you quicker answers 
than otherwise.  Moreover, it could increase your chances of getting a 
response that actually helps solve your problem.  In particular, please 
provide a toy example showing something that a reader can easily copy 
from an email and paste into R to try something just a little different. 

TRAMIER Blaise wrote:
>Hello,
>	I have been asked to perform a exponential correlation on a data set.
>Unfortunately, i did not find any simple example on how to do that with R. 
>If the correlation is significant, one asked me to also find the thresold 
>of the acceleration slope.
>
>Have any of you a little example or a good link to get me started?
>
>Best regards
>
>Blaise
>  
>
-- 
Spencer Graves, PhD, Senior Development Engineer
O:  (408)938-4420;  mobile:  (408)655-4567