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Re: st: Calculate average elements matrix (below the diagonal )


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Calculate average elements matrix (below the diagonal )
Date   Tue, 11 Sep 2012 10:28:33 +0100

There are probably more elegant ways to do it, but this works:

sysuse auto
corr price mpg rep78
mata
C = st_matrix("r(C)")
mean(abs(select(vech(C), vech(C) :< 1)))


On Tue, Sep 11, 2012 at 9:34 AM, John Antonakis <John.Antonakis@unil.ch> wrote:

> I would like to calculate the average absolute correlations of a correlation
> matrix.  E.g.,
>
> sysuse auto
> corr price mpg rep78
> mat A = r(C)
> mat list A
>
> This returns the following three correlations below the diagonal:
>
> -.45594895 .00655327 .40234039
>
> Specifically, I would like to: obtain the average absolute values of the
> below-diagonal elements:
>
> i.e., dis (abs(-.45594895) + abs(.00655327) + abs(.40234039))/3
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