Re: [R] Spectral analysis

From: Rogerio Porto <rdporto1_at_terra.com.br>
Date: Thu, 07 Jun 2007 10:22:34 -0300


David and Ted,

since David asked about wavelets, there are some examples at the packages Wavethresh and Waveslim that could be useful.

Waveslim deals with time series that are or are not a power of 2, but must be regularly spaced.

Wavethresh 3 (http://www.maths.bris.ac.uk/~wavethresh/) has methods to analyze irregular time series, as suggested by Ted but their length must be a power of 2.

Regards,

Rogerio

De: r-help-bounces_at_stat.math.ethz.ch
Para: "David LEDU" david.ledu_at_yahoo.ca
Cópia: r-help_at_stat.math.ethz.ch
Data: Wed, 06 Jun 2007 22:34:21 +0100 (BST) Assunto: Re: [R] Spectral analysis

> On 06-Jun-07 20:55:09, David LEDU wrote:
> > Hi all,
> >
> > I am dealing with paleoceanographic data and I have a C14 time serie
> > and one other variable. I would like to perform a spectral analysis
> > (fft or wavelet) and plot it. Unfortunately I don't know the exact
> > script to do this. Does anybody could send me an example to perform my
> > spectral analysis ?
> >
> > I Thank you
> >
> > David
>
> There are a lot of possible ramifications to your query,
> but for a basic spectral analysis of a series you can use
> the function spectrum() in the "stats" package.
>
> What is the role of the "other variable"?
>
> Best wishes,
> Ted.
>
> --------------------------------------------------------------------
> E-Mail: (Ted Harding) <ted.harding_at_nessie.mcc.ac.uk>
> Fax-to-email: +44 (0)870 094 0861
> Date: 06-Jun-07 Time: 22:34:07
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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. Received on Thu 07 Jun 2007 - 13:34:47 GMT

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