Great lists, I always find them useful, thank you to
everyone who contributes to them.
My question is regarding non-integer values from some data I
collected on parrots when using the poisson GLM. I observed the parrots on a
daily basis to see if they were affected by tourist presence. My key pr
011 23:10
> Aan: r-help@r-project.org
> Onderwerp: [R] Poisson GLM with a logged dependent variable...just asking for
> trouble?
>
> Dear R-helpers,
>
> I'm using a GLM with poisson errors to model integer count data as a function
> of
> one non-integer covariate.
&
Dear R-helpers,
I'm using a GLM with poisson errors to model integer count data as a
function of one non-integer covariate.
The model formula is: log(DV) ~ glm(log(IV,10),family=poisson).
I'm getting a warning because the logged DV is no longer an integer.
I have three questions:
1) Can I igno
On Wed, 1 Dec 2010, Anna Berthinussen wrote:
Hi,
I receive the following warning message when I run a poisson GLM in R:
"glm.fit: fitted rates numerically 0 occurred"
The model summary is shown below. The variable 'Species' consists of
counts of different species ranging from 0 to 4. I suspec
Hi,
I receive the following warning message when I run a poisson GLM in R:
"glm.fit: fitted rates numerically 0 occurred"
The model summary is shown below. The variable 'Species' consists of
counts of different species ranging from 0 to 4. I suspect this may
have something to do with the warn
I thought that quasipoisson family was used to model overdispersion, since
the dispersion parameter isn't fixed at one. Could you please elaborate a
little about why quasipoisson is more suitable for this non-integer poisson
data?
also, is it significant that vcov shows a difference?
--
View
Since one method of modeling rates is to use
glm(... ,family="poisson") with the observed rate (events/
person_time) on the LHS of the formula and offset=log(expected_rates)
on the RHS, I am quite happy that no error is thrown in that situation.
Reading old entries in r-help, it appears the
This is a basics beginner question.
I attempted fitting a a Poisson GLM to data that is non-integer ( I believe
Poisson is suitable in this case, because it is modelling counts of
infections, but the data collected are all non-negative numbers with 2
decimal places).
My question is, since R does
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