[R-sig-ME] declaring the variables

[Petar Milin]

Hello!
Maybe I am missing something, but I think you should first check how R 
"understands" your data structure:
 > str(<data-frame-name>)
 From this you can explitily define type that you need/want, like:
 > <data-frame-name>$Anglers = as.factor(<data-frame-name>$Anglers)
 > <data-frame-name>$Season = as.factor(<data-frame-name>$Season)
 > <data-frame-name>$Tide.phase = as.numeric(<data-frame-name>$Tide.phase)
Also, you can use: as.logical(), as.integer(), even as.character() and 
some others.

Again, I apologize if I understood you problem wrongly, but this seems 
to me a solution.

Best,
PM

On 17/11/10 05:57, Michael Larkin wrote:
> I am running a GLM with catch data from a fishery.  I understand how to run
> a GLM in R.  What I don't understand is how to declare the types of
> variables that I have.  For example, I am modeling catch with several
> different types of variables.  Here are details on my variables:
>
>
>
> Variable                               Type
> comment
>
> Anglers                                 random factor                   I
> have the names of over 100 anglers.
>
> Season                                 fixed factors                       I
> broke it up into the 4 seasons
>
> Tide phase                          Continuous variable        I have the
> proportion of the tide phase during the fishing event
>
>
>
> My R code for the GLM is:
>
>
>
> fish<- glm(Catch ~ Angler +Season + Tide, family=gaussian(identity),
> data=fishcatch)
>
>
>
> However, how do declare the types of variables used in the model?  For
> example, how do I declare that the angler variable is a random factor?
>
>
>
> Any help would be greatly appreciated.
>
>
>
> Mike
>
>
>
>
> 	[[alternative HTML version deleted]]
>
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