[R] Glm poisson

Francisco J. Zagmutt gerifalte28 at hotmail.com
Mon Mar 27 20:14:43 CEST 2006

Why are you trying to extract the values by calling a function with the name 
of the value?  glm objects are stored as a list i.e.

Hence, you can extract what you need by selecting the values on the list 




>From: "Guenther, Cameron" <Cameron.Guenther at MyFWC.com>
>To: <R-help at r-project.org>, <r-help at stat.math.ethz.ch>
>Subject: [R] Glm poisson
>Date: Mon, 27 Mar 2006 12:07:04 -0500
>I am using the glm model with a poisson distribution.  The model runs
>just fine but when I try to get the null deviance for the model of the
>null degrees of freedom I get the following errors:
> > null.deviance(pAmeir_1)
>Error: couldn't find function "null.deviance"
> > df.null(pAmeir_1)
>Error: couldn't find function "df.null"
>When I do:
> > names(pAmeir_1)
>  [1] "coefficients"      "residuals"         "fitted.values"
>  [4] "effects"           "R"                 "rank"
>  [7] "qr"                "family"            "linear.predictors"
>[10] "deviance"          "aic"               "null.deviance"
>[13] "iter"              "weights"           "prior.weights"
>[16] "df.residual"       "df.null"           "y"
>[19] "converged"         "boundary"          "model"
>[22] "call"              "formula"           "terms"
>[25] "data"              "offset"            "control"
>[28] "method"            "contrasts"         "xlevels"
>It tells me that the values are there but I can not access them.
>Any comments would be greatly appreciated.
>Thank you
>Cameron Guenther, Ph.D.
>Associate Research Scientist
>FWC/FWRI, Marine Fisheries Research
>100 8th Avenue S.E.
>St. Petersburg, FL 33701
>(727)896-8626 Ext. 4305
>cameron.guenther at myfwc.com
>R-help at stat.math.ethz.ch mailing list
>PLEASE do read the posting guide! 

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