[R] Extract estimate of error variance from glm() object

[Ben Bolker]

   ?sigma

On 12/24/24 10:13, Bert Gunter wrote:
> ?deviance  ?anova
> 
> Bert
> 
> On Tue, Dec 24, 2024 at 6:22 AM Christofer Bogaso
> <bogaso.christofer using gmail.com> wrote:
>>
>> I think vcov() gives estimates of VCV for coefficients.
>>
>> I want estimate of SD for residuals
>>
>> On Tue, Dec 24, 2024 at 7:24 PM Ben Bolker <bbolker using gmail.com> wrote:
>>>
>>> vcov(). ?
>>>
>>>
>>> On Tue, Dec 24, 2024, 8:45 AM Christofer Bogaso <bogaso.christofer using gmail.com> wrote:
>>>>
>>>> Hi,
>>>>
>>>> I have below GLM fit
>>>>
>>>> clotting <- data.frame(
>>>>      u = c(5,10,15,20,30,40,60,80,100),
>>>>      lot1 = c(118,58,42,35,27,25,21,19,18),
>>>>      lot2 = c(69,35,26,21,18,16,13,12,12))
>>>> summary(glm(lot1 ~ log(u), data = clotting, family = gaussian))
>>>>
>>>> Is there any direct function to extract estimate of Error standard deviation?
>>>>
>>>> ______________________________________________
>>>> R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
>>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>>> PLEASE do read the posting guide https://www.R-project.org/posting-guide.html
>>>> and provide commented, minimal, self-contained, reproducible code.
>>
>> ______________________________________________
>> R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide https://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.

-- 
Dr. Benjamin Bolker
Professor, Mathematics & Statistics and Biology, McMaster University
Director, School of Computational Science and Engineering
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