[R] time series periodic data

Petr PIKAL petr.pikal at precheza.cz
Wed Aug 15 14:26:25 CEST 2007

Dear all

Please help me with analysis of some periodic data. 

I have an output from measurement each minute and this output is modulated 
by rotation of the equipment (approx 6.5 min/revolution). I can easily 
spot this frequency from

spectrum(mydata, some suitable span)

However from other analysis I suspect there is a longer term oscilation 
(about 70-80 min) I am not able to find it from mentioned data.

Plese give me some hint how I could prove that such long term modulation 
of my data exist in presence of quite strong modulation by this short term 

Thank you

Best regards

Petr Pikal
petr.pikal at precheza.cz

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