Is there a leverage diagnostic test for glmmTMB models?

 ? 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>. 

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