[R] Cycle Regression Analysis in R?

[Gabor Grothendieck]

To do it from first principles using nonlinear optimization see:
http://finzi.psych.upenn.edu/R/Rhelp02a/archive/20100.html

On Jan 10, 2008 5:27 PM, Carson Farmer <cfarmer at uvic.ca> wrote:
> Hello R community,
>
> Does anyone know of a package that will perform cycle regression
> analysis? I have searched the R-help archives etc. but have come up with
> nothing so far.
> If I am unable to find an existing R package to do so, is there anyone
> familiar with fitting sine functions to data.  My problem is this:
> I have a long time-series of daily SWE estimates (SWE = snow water
> equivalence, or the amount of water stored in a snowpack) which follows
> a sinusoidal pattern, and I need to estimate the parameters of the sine
> function that best fits this data. While there may be many contributing
> sine functions and/or linear trends, I am only interested in a single
> sine function that most closely fits the data (trends can be removed
> separately if need be).  Perhaps some sort of non-linear least squares
> method would be best?
>
> Any help, or suggestions to get me on the right track are greatly
> appreciated.
>
> Carson
>
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