[R] Replicate Excel's LOGEST worksheet function in R

[David Winsemius]

On Nov 12, 2010, at 4:22 PM, cran.30.miller_2555 at spamgourmet.com wrote:

> Hi -
>
>     I have a dataframe of (x,y) values. I'd like to fit an exponential
> curve to the data for further statistical analysis (pretty much the  
> same
> functionality provided by Excel's LOGEST worksheet array function).  
> Can
> someone point me to the (set of) functions/ package that is best  
> suited to
> provide this functionality? Admittedly, I am a novice in the use of R
> statistical functions, so a brief example of how to compute a  
> correlation
> coefficient off a fitted exponential curve would be greatly  
> appreciated
> (though I could probably work through it over time if I knew the  
> proper R
> tools).
>

Probably (not seeing a clear description of the LOGEST function):

?exp
?log
?lm
?cor

-- 
David Winsemius, MD
West Hartford, CT