Re: [R] A model for possibly periodic data with varying amplitude [repost, much edited]

From: Dieter Menne <dieter.menne_at_menne-biomed.de>
Date: Wed 16 Aug 2006 - 16:43:02 EST

Andrew Robinson <A.Robinson <at> ms.unimelb.edu.au> writes:

> I have up to 12 measures of a protein for each of 6 patients, taken
> every two or three days. The pattern of the protein looks periodic,
> but the height of the peaks is highly variable. I'm testing for
> periodicity using a Monte Carlo simulation envelope approach applied
> to a cumulative periodogram. Now I want to predict the location of
> the peaks in time. Of course, the peaks might be occurring on
> unmeasured days.

Have you checked one of the methods in Chapter 13. of MASS to obtain a smoothed estimate?

Dieter



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