Under dispersion; Was: [R] binomial glm warnings revisited

[Tord Snall]

Dear all,

>> BUT, note the under dispersion. I GUESS it is because I have surveyed a
>> moss on marked trees at three occations (with two years in between). The
>> response 1 means that the moss has disappeared, and dbh is tree diameter.
>> (This corresponds to revisitng patients who has a disease, and whose weight
>> is unchanged between the visits. H0: weight does not affect tha chance of
>> recovery from the disease)
>
>Don't trust deviances as measures of dispersion with binary data! 
>