[R] Difference between spec.pgram & spec.ar

[Bert Gunter]

On Mon, Apr 9, 2012 at 9:27 AM, Bazman76 <h_a_patience at hotmail.com> wrote:
> Yes I agree, there may be something pathalogical in the way at least one of
> the models handles the data.  That's why I was trying to get a better handle
> on how the two functions spec.prgm() and spec.ar() work.
>
> The data has been processed by a wavelet analysis, so what you are seeing as
> the "raw" data is in fact the level1 details from the wavelet anlaysis.
>
> In theory this should only have high frequency components, that was why I am
> so surpirsed to see such strong components at low frequencies.
>
> That is not a R quesiton per se, but surely how spec.prgm() and spec.ar()
> work is?

Not necessarily, if they are e.g. C or Fortran programs merely called
by R. Indeed, even if written in R, if the algorithms are the issue,
then that is essentially a statistics/numerical analysis matter, not
an R programming one.

-- Bert

>
>
>
> --
> View this message in context: http://r.789695.n4.nabble.com/Difference-between-spec-pgram-spec-ar-tp4541358p4543191.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.



-- 

Bert Gunter
Genentech Nonclinical Biostatistics

Internal Contact Info:
Phone: 467-7374
Website:
http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm