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problem with correct frequency units using pwelch or other spectral estimate functions in matlab

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Ramirez
Ramirez 2012-11-15
I understand that when calculating a spectrum with pwelch the sampling frequency is given by the input variable fs
Assuming I have a monthly time series X of length T = 120 [months] (12 years):
length(X) = 120
Now I would like to calculate a spectrum and get a frequency vector with unit [cycles/year]. Which fs do I have to choose to get the correct output in the frequency vector or plot?
pwelch(X,[],[],[],fs)
[a b] = pwelch(X,[],[],[],fs)
Thanks!!!

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Rick Rosson
Rick Rosson 2012-11-15
fs = 12; % samples per year

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