On 14.05.2010 06:03, vikrant wrote:
series<-c(0,0,0,0,0,10,0,0,0,0,0,10,0,0,0,0,0,10,0,0,0,0,0,10,0,0,0,0,0,10 ,0,0,0,0,0,10,0,0,0,0,0,10,0,0,0,0,0,10,0,0,0,0,0,10,0,0,0,0,0,10) Here ain this example after period 4 the pattern repeats. So we can say that the above series have a period of 4. Now my question is by using the function spec.pgram(series, log="no") we will get a graph of power vs frequency. Correct me if I am wrong. Now from this graph I want to determine the period of seasonality. How should I determine it??
You find that the first highest peak is at freq 0.1666667 hence 1/0.1666667 = 6 is your period (not 4). But as I said before, you need to read a textbook about Fourier analysis / the spectrum...
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