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<p class=MsoNormal>Hi ADMB users,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I’m new to glmmADMB and R and just have a basic
question...<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>I have owl count data (y) from about 160 routes across
Ontario, Canada. I am simply interested in looking at annual indices of owls.
My data is overdispersed and zero-inflated, so I would like to fit it to a
neg.binomial distribution and also use route as a random effect in the model. I
have included an offset in the model since owl counts need to be adjusted according
to effort (# of stations sampled)<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>This is what I have:<o:p></o:p></p>
<p class=MsoNormal>fit=glmm.admb(y~yr,random=~1,group="route",data=nswoc,family="nbinom",
offset(log(stn)))<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>My problem is that I don’t think the offset for the
model is working properly. I get the exact same output with or without the
offset included in the model. Am I doing this right? Anyone else have this
problem before?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks<o:p></o:p></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'>---------------------------------------------------------------------------------------------------------<o:p></o:p></span></p>
<p class=MsoNormal><b><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'>Myles
Falconer<o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-family:"Times New Roman","serif"'>Ontario
Region Project Biologist,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Times New Roman","serif"'>Bird Studies
Canada,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Times New Roman","serif"'>115
Front St., P.O. Box 160,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Times New Roman","serif"'>Port
Rowan, ON<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Times New Roman","serif"'>N0E 1M0
Canada<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Times New Roman","serif"'>Email: <u>mfalconer@birdscanada.org</u><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Times New Roman","serif"'>Ph:
1-888-448-2473 ext. 165<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Times New Roman","serif"'>BSC
website: http://www.bsc-eoc.org/<o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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