Can someone explain me this spec.pgram effect?
Code:
period.6<-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)
period.5<-c(0,0,0,0,0,10,0,0,0,0,10,0,0,0,0,0,0,10,0,0,0,0,10,0,0,0,0,0,0,10
,0,0,0,0,10,0,0,0,0,0,0,10,0,0,0,0,10,0,0,0,0,0,0,10,0,0,0,0,10,0)
par(mfrow=c(2,1))
spec.pgram(period.6, log="no")
spec.pgram(period.5, log="no")
The first series has period 6 and shows its periodicity in 1/6 and
harmonics. In the second series I was expecting to see a signal occurring at
frequency 1/5 but it does not. Can anybody explain me why?
Thanks in advance,
Nuno
______________________________________________
Centro de Oceanografia - IO-FCUL, Portugal
Center for Quantitative Fisheries Ecology - ODU, USA
email: [EMAIL PROTECTED] ; [EMAIL PROTECTED]
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