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st: GMM, Error 506: positive definite initial weight matrix


From   Richard Kendall-Smith <richpks@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: GMM, Error 506: positive definite initial weight matrix
Date   Wed, 10 Aug 2011 16:38:44 -0600

Hi,

I am trying to run a system of equations using the gmm command. When I
estimate the two equations separately the program runs perfectly. However,
when I try and estimate the two equations simultaneously I receive error
506 stating that the initial weight matrix is not positive definite. Any
ideas on how I might resolve this would be greatly appreciated.

Thanks,

Richard
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