Skip to content
Prev 308324 / 398506 Next

Assessing overdispersion and using quasi model with lmer, possible?

swertie 
Hello! 
I am trying to model data on species abundance (count data) with a poisson
error distribution. I have a fixed and a random variables and thus needs a
mixed model. I strongly doubt that my model is overdispersed but I don't
know how to get the overdispersion parameter in a mixed model. Maybe someone
can help me on this point. Secondly, it seems that quasi models cannot be
implemented with the function lmer, is there an option? If not, I certainly
should go to variable transformation and use a gaussian error distribution,
but it is not optimal.
Thank you!



--
View this message in context: http://r.789695.n4.nabble.com/Assessing-overdispersion-and-using-quasi-model-with-lmer-possible-tp4646626.html
Sent from the R help mailing list archive at Nabble.com.

Thread (3 messages)

swertie Assessing overdispersion and using quasi model with lmer, possible? Oct 18 Ben Bolker Assessing overdispersion and using quasi model with lmer, possible? Oct 19 swertie Assessing overdispersion and using quasi model with lmer, possible? Oct 22