generate correlated dataset

To get a target correlation between observations in different 
clusters, consider the following:

	  var(Y) = E(var(Y|X))+var(E(Y|X)).

	  The correlation between observations in a give cluster is determined 
by E(var(Y|X)).  To get a target correction between clusters, select 
E(Y|X)) so var(Y) is what you want.

hope this helps.  spencer graves

generate correlated dataset

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