Hi,Saji
Thanks for your detailed interpretation.
I also learned a lot from you.
Best regards!
Jing
======= 2005-03-18 12:01:00=======
Message: 1
Date: Thu, 17 Mar 2005 10:58:38 -1000
From: Saji Hameed <saji@hawaii.edu>
Subject: Re: ncl-talk Digest, Vol 16, eofunc_varimax
To: ncl-talk@ucar.edu
Message-ID: <11ffbe11bdf2.11bdf211ffbe@hawaii.edu>
Content-Type: text/plain; charset=us-ascii
Mike,
Jing has given you part of the answer. I will try to fill up what she
has not mentioned.
I have not tried this, but i have no reason to believe why it should not
work.
1. eofunc_ts should be able to return your time series after varimax
rotation, the same way it does return the time series for the unrotated
eofs. I guess this function regresses (evec) on (data) to obtain the
time series.
2. You can always calculate the percentage variance explained by a
pattern once you have (evec) and its corresponding time series and of
course the data.
a- sum up the variance in the (data) over the same domain that you
had specified to the eof- functions.
b- calculate the variance associated with each (evec) pattern.
To do this multiply evec with the time series, find the variance
and sum it up over the domain
c - (b/a)*100 is the percentage variance associated with each
pattern.
A grads script that can do varimax can be found at
http://mpi-web.dkrz.de/en/misc/software/grads/varimax.gs
saji
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