[R-sig-ME] Is there a leverage diagnostic test for glmmTMB models?

[Ben Bolker]

   As I mentioned in my CrossValidated answer 
https://stats.stackexchange.com/questions/478727/leverage-diagnostic-test-not-supported-for-glmmtmb-models-in-r/479298#479298 
, this does work with the add-on influence_mixed function in the glmmTMB 
package ; you just need to specify  group=".cases" (or leave the group 
blank, since ".cases" is the default value).

    This doesn't use hatvalues, which as I commented there aren't 
available (yet) for glmmTMB; instead, it does brute-force leave-one-out 
computations (although it can do them in parallel).

    It would be a good idea making this functionality more easily 
available, but I've messed up in the past when trying to export 'car' 
functionality, so I'd like to be careful.


   cheers

     Ben


On 7/27/20 3:47 PM, John Fox wrote:
> Dear April,
>
> Unfortunately, there's no hatvalues() method for "glmmTMB" objects, 
> nor do functions in the car package, where the influenceIndexPlot() 
> function that you tried to use originates, have "glmmTMB" methods. car 
> does have methods for the "merMod" objects produced by functions in 
> the lme4 package and for the "lme" objects produced by the lme() 
> function in the nlme package, but those probably aren't useful to you.
>
> I'm willing to look into providing the necessary infrastructure in the 
> car package to support glmmTMB() but can't promise to do that before 
> the Fall.
>
> Best,
>  John
>
> --------------------------------------------
>   John Fox
>   Professor Emeritus
>   McMaster University
>   Hamilton, Ontario, Canada
>   web: https://socialsciences.mcmaster.ca/jfox/
>
> On 7/27/2020 1:40 PM, April Martinig wrote:
>> Hello,
>>
>> I've posted my question to Cross Validated, but I am also linking to 
>> it here 
>> <https://stats.stackexchange.com/questions/478727/leverage-diagnostic-test-not-supported-for-glmmtmb-models-in-r> 
>> because it might have been missed.
>>
>> I am trying to use the DHARMa package to test for how much leverage 
>> specific points (on one extreme) for my response variable has on my 
>> output.
>>
>> In my question I have posted the data, what I have tried, and linked 
>> to other sources. Thank you in advance.
>>
>> Take care,
>> April
>>
>> ---
>> April Martinig, M.Sc.
>> Ph.D. Candidate in Ecology
>> University of Alberta
>> martinig.weebly.com
>> “I do not accept the conventional order of things as a given."
>>
>> https://stats.stackexchange.com/questions/478727/leverage-diagnostic-test-not-supported-for-glmmtmb-models-in-r 
>> <https://stats.stackexchange.com/questions/478727/leverage-diagnostic-test-not-supported-for-glmmtmb-models-in-r>. 
>>
>>     [[alternative HTML version deleted]]
>>
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