[R] Simple spectral analysis

From: Georg Hoermann <georg.hoermann_at_gmx.de>
Date: Mon 08 Jan 2007 - 16:12:34 GMT


Hello world,

I am actually trying to transfer a lecture from Statistica to R and I ran into problems with spectral analysis, I think I just don't get it 8-(
(The posting from "FFT, frequs, magnitudes, phases" from 2005 did not enlighten me)

As a starter for the students I have a 10year data set of air temperature with daily values and I try to get a periodogram where the annual period (365 days) should be clearly visible (in statistica I can get the frequencies and the period). I tried the spectrum() and pgram() functions, but did not find a way through... The final aim would be to get the periodogram (and the residuals from the reassembled data set...)

Thanks and greetings,
Georg

The data set:

air = read.csv("http://www.hydrology.uni-kiel.de/~schorsch/air_temp.csv") airtemp = ts(T_air, start=c(1989,1), freq = 365) plot(airtemp)

-- 
Georg Hoermann, Dep. of Hydrology, Ecology, Kiel University, Germany
+49/431/23761412, mo: +49/171/4995884, icq:348340729, skype: ghoermann

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Received on Tue Jan 09 04:24:44 2007

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