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
----- Original Message -----
From: "Vittorio Colagrande" <colavitto...@virgilio.it>
To: <r-help@r-project.org>
Sent: Friday, March 13, 2009 2:46 PM
Subject: [R] Fourier Analysis Help
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
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