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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>You might want to check your model using
the derivative checker to make sure that you have not included code for which
the derivative can’t be calculated.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mark<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 color=navy face=Calibri><span style='font-size:
11.0pt;color:navy'><a
href="http://www.fisheriesstockassessment.com/TikiWiki/tiki-index.php?page=Spatial+Analysis+for+Stock+Assessment+2008"></a></span><o:p></o:p></font></p>
<p class=MsoNormal><font size=2 color=navy face=Calibri><span style='font-size:
11.0pt;color:navy'> </span></font><font size=3 color=navy><span
style='font-size:12.0pt;color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Calibri><span style='font-size:
11.0pt;color:navy'>Mark Maunder <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Calibri><span style='font-size:
11.0pt;color:navy'>Head of the Stock Assessment Program</span></font><font
size=3 color=navy><span style='font-size:12.0pt;color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Calibri><span style='font-size:
11.0pt;color:navy'>Inter-American Tropical Tuna Commission<br>
8604 La Jolla Shores Drive<br>
La Jolla, CA, 92037-1508, USA<br>
<br>
Tel: (858) 546-7027<br>
Fax: (858) 546-7133<br>
<a href="mailto:mmaunder@iattc.org">mmaunder@iattc.org</a><br>
</span></font><font size=2 color=navy face=Arial><span style='font-size:10.0pt;
font-family:Arial;color:navy'><a
href="http://www.fisheriesstockassessment.com/TikiWiki/tiki-index.php?page=Mark+Maunder">http://www.fisheriesstockassessment.com/TikiWiki/tiki-index.php?page=Mark+Maunder</a></span></font><font
color=navy><span style='color:navy'><a
href="http://iattc.org/iattc-staffMMaunder.htm"></a></span></font><font
color=navy><span style='color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Calibri><span style='font-size:
11.0pt;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Calibri><span style='font-size:
11.0pt;color:navy'>Visit the AD Model Builder project at<br>
<a href="http://admb-project.org/"><font color="#810081"><span
style='color:#810081'>http://admb-project.org/</span></font></a></span></font><font
size=3 color=navy><span style='font-size:12.0pt;color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Calibri><span style='font-size:
11.0pt;color:navy'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Calibri><span style='font-size:
11.0pt;color:navy'>See the following website for information on fisheries stock
assessment<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Calibri><span style='font-size:
11.0pt;color:navy'><a href="http://www.fisheriesstockassessment.com/">http://www.fisheriesstockassessment.com/</a></span></font><font
color=navy><span style='color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p>
</div>
<div>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
users-bounces@admb-project.org [mailto:users-bounces@admb-project.org] <b><span
style='font-weight:bold'>On Behalf Of </span></b>John<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, January 14, 2010
6:56 AM<br>
<b><span style='font-weight:bold'>To:</span></b> users@admb-project.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [ADMB Users] Oscillating
likelihood values?</span></font><font size=3 face="Times New Roman"><span
style='font-size:12.0pt;font-family:"Times New Roman"'><o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Hi<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>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:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>15<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>
18<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>14.5<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>
18.5<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>14<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>
19<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>13.5<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>
19.5<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>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.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Any
advice would be very welcome!<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><b><font size=2 color=navy face=Calibri><span lang=EN-GB
style='font-size:10.0pt;color:navy;font-weight:bold'>John E. Murray<o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color=navy face=Calibri><span lang=EN-GB
style='font-size:10.0pt;color:navy;font-weight:bold'>OLRAC<o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color="#1f497d" face=Calibri><span
lang=EN-GB style='font-size:10.0pt;color:#1F497D;font-weight:bold'>Silvermine
House, <st1:place w:st="on"><st1:PlaceName w:st="on">Steenberg</st1:PlaceName> <st1:PlaceType
w:st="on">Office Park</st1:PlaceType></st1:place>.<o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color="#1f497d" face=Calibri><span
lang=EN-GB style='font-size:10.0pt;color:#1F497D;font-weight:bold'>Tokai 7945, <st1:place
w:st="on"><st1:City w:st="on">Cape Town</st1:City>, <st1:country-region w:st="on">South
Africa</st1:country-region></st1:place>.<o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color="#1f497d" face=Calibri><span
lang=EN-GB style='font-size:10.0pt;color:#1F497D;font-weight:bold'>Office +27
(0)21 702 4111<o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color="#1f497d" face=Calibri><span
lang=EN-GB style='font-size:10.0pt;color:#1F497D;font-weight:bold'>Fax +27
(0)21 702 4333<o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color="#1f497d" face=Calibri><span
lang=EN-GB style='font-size:10.0pt;color:#1F497D;font-weight:bold'>Email -
john@olrac.com<o:p></o:p></span></font></b></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
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