How to set sampling frequency as cycle per year??
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How to set sampling frequency as cycle per year??
Accepted Answer
Wayne King
on 10 Jan 2013
Edited: Wayne King
on 10 Jan 2013
It depends on the time between your data samples. What is the sampling interval? Were your data acquired at a rate of 1 sample per year, then you just set Fs = 1. If the time interval between samples is 6 months, then you set the sampling rate to 2 (for 2 samples per year).
For example, the time between the sunspot number data is 1 year, so it's one sample per year
load sunspot.dat
relNums=sunspot(:,2);
[pxx,f] = periodogram(relNums,[],[],1);
plot(f,10*log10(pxx))
xlabel('Cycles/Year'); ylabel('dB');
title('Periodogram of Relative Sunspot Number Data');
So I just set the sampling frequency to be 1 and the output of periodogram is in cycles/year.
If the sampling interval is one month, one month between samples, then the sampling frequency would be 12 to yield cycles/year
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