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wheareas
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 freque...