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<p class="MsoNormal"><span style="color:#1F497D">Size=(mean^2)/(mean*tau-mean)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Because <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Var=mean*tau<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">And<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Var=mean+(mean^2)/size<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> users-bounces@admb-project.org [mailto:users-bounces@admb-project.org]
<b>On Behalf Of </b>Mark Maunder<br>
<b>Sent:</b> Saturday, February 11, 2012 12:19 PM<br>
<b>To:</b> users@admb-project.org<br>
<b>Subject:</b> [ADMB Users] Relationship between NB in ADMB and NB in R<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">How does the tau parameter in the ADMB negative binomial relate to the size parameter in R’s dnbinom(x, size, prob, mu, log = FALSE) function?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Mark Maunder <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">IATTC fall workshop: Using Oceanography for Fisheries Stock Assessment and Management<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:black">11-14 October 2011, La Jolla, CA<o:p></o:p></span></p>
<p class="MsoNormal"><a href="http://www.fisheriesstockassessment.com/TikiWiki/tiki-index.php?page=Using+Oceanography+for+Fisheries+Stock+Assessment+and+Management+2011">http://www.fisheriesstockassessment.com/TikiWiki/tiki-index.php?page=Using+Oceanography+for+Fisheries+Stock+Assessment+and+Management+2011</a><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Verdana","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Head of the Stock Assessment Program
<o:p></o:p></p>
<p class="MsoNormal">Inter-American Tropical Tuna Commission
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">President<o:p></o:p></p>
<p class="MsoNormal">ADMB Foundation<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">8604 La Jolla Shores Drive<o:p></o:p></p>
<p class="MsoNormal">La Jolla, CA, 92037-1508, USA<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Tel: (858) 546-7027<o:p></o:p></p>
<p class="MsoNormal">Fax: (858) 546-7133<o:p></o:p></p>
<p class="MsoNormal"><a href="mailto:mmaunder@iattc.org">mmaunder@iattc.org</a><o:p></o:p></p>
<p class="MsoNormal"><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><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Visit the AD Model Builder project at<o:p></o:p></p>
<p class="MsoNormal"> <a href="http://admb-project.org/">http://admb-project.org/</a><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">See the following website for information on fisheries stock assessment
<a href="http://www.fisheriesstockassessment.com/">http://www.fisheriesstockassessment.com/</a><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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