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2004 Jan 22
1
spectrum
...ting the spectral power of a time series: 1) I came across a funny thing with the following code: data(co2) par(mfrow=c(2,1)) co2.sp1<-spectrum(co2,detrend=T,demean=T,span=3) co2.sp2<-spectrum(co2[1:468],detrend=T,demean=T,span=3) The first plot displays the frequencies ranging from 0 to 6 whearas the second plot displays the same curve but with frequencies between 0 and .5 although it is based on the same data (length(co2)=468). Why does the selection (co2[1:468]) determine the vector of frequencies and plot it obviously incorrectly? Generally, is it possible to choose the vector of frequ...