Re: How to create conditional correlated random values given exogenous data

I just want to comment on the single word "structure" in "correlation
structure". Just exactly what IS a correlation structure?

If I tell you that X and Y have ZERO correlation, and I give you 100
points (any 100 you choose) insid a unit square from the origin,
to sprinkle on the X-Y plane to characterize the ZERO -correlation
structure, can you do it? What do you envision to be that correlation
"striuture"?
I'm not sure whether I get to the point of your answer. With
correlation structure I mean the covariance matrix. And if your
variables X and Y are uniformly distributed the X-Y-pane should be
evenly filled.


This is a very serious question relating to what you are asking.
Perhaps
if you realize how miserably you will FAIL in characterizing a zero
correlation structure, that you will not find ANY structure to
characterize
points that will have a structure of any value, and perhaps then think
of
some other ways of asking your questioni to chieve what you really
wat to do.

-- Reef Fish Bob,

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