[R] help! - spectral analysis - spec.pgram

[vikrant]

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??


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