Re: about the "Jave" argument of the "specx_anal"

> I have been used the function "specx_anal" to carry out
> the spectra analysis. I didn't know how to give a proper
> Arguments "Jave" .The data length is 153, and I want to get
> the 30~60 periodity. which "Jave" number shoud I give?
> Are there somebody can give me any suggestion?
> Thanks!

The "jave" argument basically specifies the bandwidth (bw). Essentially,
it does a running average over the periogogram estimates.

ncl 0> df = 1./153 ; ===> 0.006535948
ncl 1> df30 = df*30 ; ===> 0.1960784
ncl 2> df60 = df*60 ; ===> 0.3921569

bw = df60-df30
jave = bw/df ; ===> 30

Since jave must be odd ... set jave=31

In data analysis, there is no substitute for data ... and lots of it!
There are only 153 days [?] of data... 76 periodogram estimates.

good luck
D

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Received on Sun Mar 26 2006 - 08:38:49 MST