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st: Calculate variances of subsamples


From   Lars Knuth <knuth.lars@googlemail.com>
To   statalist <statalist@hsphsun2.harvard.edu>
Subject   st: Calculate variances of subsamples
Date   Tue, 1 Jun 2010 12:51:09 +0200

Dear Statalisters,

I have a panel dataset including variables with time series of weekly returns.

I want to calculate the variance at the end of each month for the last
three years of weekly returns for each variable.
Could anyone give some hints?

Thanks in advance!
Lars Knuth
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