R help - Sep 2004 - Enright/Chi-square periodogram / periodicity

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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>>>>> "MalladiS" == Malladi, Sukhaswami <smalladi at
lexgen.com>
>>>>>     on Mon, 27 Sep 2004 09:17:38 -0500 writes:
    MalladiS> I am trying to compute the periodicity of a time
    MalladiS> series.  I would like to know which function in R
    MalladiS> does it.

Have you considered using  spectrum()  with its many variants?

I guess that its methodology is much better than the one in

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

(a bit old)

    MalladiS> Greatly appreciate your help.

You're welcome
Martin Maechler, ETH Zurich