I'm wondering if its possible to drop the error terms that are
included by default in sem models. I've searched in the manual and
online but I can't find any indication that this is possible. I
imagine its not, but I wanted to check with the experts to make sure.
(I'm estimating a behavior genetic model with data on MZ and DZ twins
-- the so-called ACE model.)
Thank you,
Jacob Felson
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