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Re: Seasonal Variation in Trend Analysis [message #56075 is a reply to message #56074]

Thu, 27 September 2007 05:04

Ingo von Borstel
Messages: 54
Registered: September 2006

Member

Hi,
>
> Does anyone happen to have an IDL example of some
> code that might remove seasonal variation in a time
> series? Or some suggestions for how to proceed in IDL?
> I can see that I might want to use a model that has
> sin and cosine terms, but I can't see how to find the
> coefficients of such a model in IDL.

I'd do a Fourier transform, filter out the terms that correspond to the
seasonal frequency/ies and possibly do a back-transform.

Best regards,
Ingo

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Ingo von Borstel <newsgroups@planetmaker.de>
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[Message index]

		Re: Seasonal Variation in Trend Analysis By: wita on Mon, 01 October 2007 12:16
		Re: Seasonal Variation in Trend Analysis By: R.G.Stockwell on Fri, 28 September 2007 09:35
		Re: Seasonal Variation in Trend Analysis By: David Fanning on Fri, 28 September 2007 09:13
		Re: Seasonal Variation in Trend Analysis By: David Fanning on Fri, 28 September 2007 07:34
		Re: Seasonal Variation in Trend Analysis By: wita on Fri, 28 September 2007 05:09
		Re: Seasonal Variation in Trend Analysis By: David Fanning on Thu, 27 September 2007 12:27
		Re: Seasonal Variation in Trend Analysis By: wita on Thu, 27 September 2007 12:09
		Re: Seasonal Variation in Trend Analysis By: R.G.Stockwell on Thu, 27 September 2007 10:26
		Re: Seasonal Variation in Trend Analysis By: David Fanning on Thu, 27 September 2007 06:13
		Re: Seasonal Variation in Trend Analysis By: David Fanning on Thu, 27 September 2007 06:12
		Re: Seasonal Variation in Trend Analysis By: Kenneth P. Bowman on Wed, 26 September 2007 20:01
		Re: Seasonal Variation in Trend Analysis By: Ingo von Borstel on Thu, 27 September 2007 05:04
		Re: Seasonal Variation in Trend Analysis By: R.G.Stockwell on Wed, 26 September 2007 15:42

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