[ADMB Users] eigenvectors of the Hessian and parameter errors

[David Holmgren]

Many thanks!  It is usually the case that four of 24 eigenvalues are negative.  I'm not fixing any parameters, or doing the minimization in phases.

Dave H.

On 2011-10-06, at 8:27 AM, dave fournier wrote:

> 
> I sent this once but it seems to have disappeared .. so again
> 
> The error gets printed out in two cases I think.  1.) if the eigenvalues of the Hessian are not positive.
> 2) If the  std dev of a dependent variables computed by the delta method is not positive. However
> if that parameter is not active then the message will get produced since its gradient is 0.
> There was some attempt to make this a bit less confusing at some time, but maybe it died somewhere.
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David Holmgren
holmgren at telus.net