|Date: ||Wed, 1 Jun 2011 10:17:06 -0400|
|Reply-To: ||R B <email@example.com>|
|Sender: ||"SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>|
|From: ||R B <firstname.lastname@example.org>|
|Subject: ||Re: two factor hierachical model|
|Content-Type: ||text/plain; charset=ISO-8859-1|
Please provide an illustration of your dataset and post your syntax.
On Wed, Jun 1, 2011 at 9:46 AM, Benjamin Spivak (Med)
> Hi all, this is my first post.
> I am currently attempting to fit a two factor hierachical model with a
> random subject effect (for nested design). However, when I run my model I
> get the following message "The final hessian matrix is not positive definite
> though all convergence criteria are satisfied". When I look at my estimates
> of covariance parameters table, I find that my Intercept (subject) variance
> is zero, with the message that my covariance parameter is redundant. If
> anyone can explain what is occuring and give me some advice on how to fix
> it, I would be very grateful.
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