[R] Enright/Chi-square periodogram / periodicity

[Malladi, Sukhaswami]

I am trying to compute the periodicity of a time series.
I would like to know which function in R does it. 

Also, how do I plot a Enright / Chi-square periodogram using R ?
( Enright, J.T., 1965, Journal of Theoret. Biol. 8,426-468) 

Greatly appreciate your help.

Thanks in advance,
Sukhaswami Malladi




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