zero inflated poisson/underdispersed data

[dbutler13]

Hi,

I am fitting a 2 level poisson model where my data are underdispersed (mean>variance).
Is there an option or way to account for this using runmlwin or within MLwin directly?

Thanks
Danielle

[ChrisCharlton]

You should be able to specify this by adding the extra option, in the same way as for extra-binomial variation (see the -runmlwin- help). I notice that this isn't mentioned as working for Poisson in the current documentation, so I will look into updating this for a later release.

[dbutler13]

Thank you!
Danielle