Re: [R] newbie: fourier series for time series data

2011-06-01 Thread eddie smith
t; phase portrait ( plot derviative versus value ) to again get some idea what > you may have that makes sense as model to fit. > > > > > Date: Tue, 31 May 2011 10:35:16 -0700 > From: spencer.gra...@structuremonitoring.com > To: eddie..

Re: [R] newbie: fourier series for time series data

2011-05-31 Thread Mike Marchywka
kes sense as model to fit. Date: Tue, 31 May 2011 10:35:16 -0700 From: spencer.gra...@structuremonitoring.com To: eddie...@gmail.com CC: r-help@r-project.org Subject: Re: [R] newbie: fourier series for time series data On 5/31/2011 5:12 AM, eddie smith wrote: > Hi Guys, > > I had a

Re: [R] newbie: fourier series for time series data

2011-05-31 Thread Oliver
To get an overview, you could just play around with fft() and spectrum(), two functions, which R offers by default (assuming you know Fourier Transformation). fft() gives you back complex spectrum. There also is a refcard that gives an overview on Time Series analysis from Vito Ricci: http://c

Re: [R] newbie: fourier series for time series data

2011-05-31 Thread Spencer Graves
On 5/31/2011 5:12 AM, eddie smith wrote: > Hi Guys, > > I had a monthly time series's data of land temperature from 1980 to 2008. > After plotting a scatter diagram, it seems that annually, there is a semi > sinusoidal cycle. How do I run Fourier's series to the data so that I can > fit model on it

[R] newbie: fourier series for time series data

2011-05-31 Thread eddie smith
Hi Guys, I had a monthly time series's data of land temperature from 1980 to 2008. After plotting a scatter diagram, it seems that annually, there is a semi sinusoidal cycle. How do I run Fourier's series to the data so that I can fit model on it? I am really sorry for my question sound stupid, b