regression matrix of a /nbn/
returns a dimnamed matrix indicating with
rho an arc from row
to column nodes (0 everywhere else) where
rho is the
regression coefficient. Also conditional standard deviations can be
introduced as diagonal elements but
mu coefficient are lost...
It is advisable to normalize the /nbn/ first.
Indicates if the standard deviations must placed in the diagonal positions.
A dimnamed matrix
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