[ADMB Users] Oscillating likelihood values?

[John]

Hi

 

I have been browsing through the manuals and posts on the ADMB site, but
could not find a reference to what I am experiencing at the moment with my
code. The likelihood value seems to be oscillating between two values, 'A'
and 'B', with the distance between the values increasing slightly with each
iteration. It would look something like this:

15

  18

14.5

  18.5

14

  19

13.5

  19.5

 

It keeps on doing this for several iterations, and then gives the "Function
minimizer: step size too small - ialph=1" error. Is there anything in
particular that I can do to pinpoint the problem? I have disabled all but
one of the model parameters, yet the problem persists. I have even tried
other model parameters, one at a time, but to no avail.

 

Any advice would be very welcome!

 

Regards,

John E. Murray

OLRAC

Silvermine House, Steenberg Office Park.

Tokai 7945, Cape Town, South Africa.

Office +27 (0)21 702 4111

Fax +27 (0)21 702 4333

Email - john at olrac.com

 

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