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Re: st: How to perform GLM with nested observations


From   "Austin Nichols" <austinnichols@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: How to perform GLM with nested observations
Date   Wed, 23 Jul 2008 12:32:54 -0400

Katherine <K.Boughey@uea.ac.uk>:
Try:
glm count x*, link(log) cl(site)
or
poisson count x*, cl(site)

On Wed, Jul 23, 2008 at 12:14 PM,  <K.Boughey@uea.ac.uk> wrote:
> Dear List,
>
> I have 500 sites, and each site contains twelve transects.
>
> My dependent variable is the number of bats encountered along each transect.
>
> My independent variables have been measured at either transect or site
> level and include:
> habitat type (categorical) measured at transect level
> distance to nearest water feature measured at transect level
> proportion of woodland, measured at site level
> density of water features, measured at site level
>
> Is there a way I can include all 6000 observations and all independent
> variables (both categorical and continuous and at both scales) in a
> GLM-type analysis that, critically, allows for the lack of independence
> between observations within the same site, caused by the nested sample
> design?
>
> Many thanks,
> Katherine
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