Re: [R] Fourier Analysis Help

From: Murray Cooper <myrmail_at_earthlink.net>
Date: Fri, 13 Mar 2009 15:53:36 -0400

Just a word of caution. Having done a lot of work with 24 hour blood pressure and ecg recordings, these series are seldom stationary which presents problems with spectral analysis. I don't know what your ultimate goal is, but in my work I found it often better to work with subsets, of the series, chosen according to the needs of the study. There is an extensive literature, on this type of study. If you haven't done so, I encourage you to do a literature search.

Murray

> Dear R-help members,
>
> To whom it may concern, our research group is conducting a study to
> evaluate the predictive
> value of 24 hour blood pressure variability.
> We are looking for an R routine that performs a fast Fourier transform
> spectral analysis
> (with an output of the approximation function of the Fourier and estimates
> the validity
> of the model for the various harmonics).
> Thanks
> Vittorio Colagrande
> [[alternative HTML version deleted]]
>
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>



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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 Fri 13 Mar 2009 - 18:56:42 GMT

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