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.
str(pAmeir_1)
Hence, you can extract what you need by selecting the values on the list
i.e.
pAmeir_1$df.null
pAmeir_1$null.deviance
Cheers
Francisco
>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
>
>Hello,
>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
>
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