[R-sig-ME] lme4, lme4a, and overdispersed distributions (again)

David Duffy davidD at qimr.edu.au
Thu Jun 24 23:31:59 CEST 2010

On Thu, 24 Jun 2010, Jeffrey Evans wrote:

> What do you think of the suggestion that a beta-binomial mixture
> distribution could be used to model overdispersed binomial data?
> Would this be a techinically correct and logistically feasible solution?

If you have a relatively simple setup for the random effects, then the 
nonparametric ML models can be used for overdispersed data: these allow an 
arbitrary distribution for the random effects (as a mixture of 
distributions).  See the npmlreg package.

| David Duffy (MBBS PhD)                                         ,-_|\
| email: davidD at qimr.edu.au  ph: INT+61+7+3362-0217 fax: -0101  /     *
| Epidemiology Unit, Queensland Institute of Medical Research   \_,-._/
| 300 Herston Rd, Brisbane, Queensland 4029, Australia  GPG 4D0B994A v

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