Yes, I am trying to run the Vuong test.
The other model with which I am comparing the lme4 model belongs to the
"frontier" class of models. I did use nonnest2 but got the following error:
Error in UseMethod("llcont") :
no applicable method for 'llcont' applied to an object of class "frontier"
So I decided to calculate the Vuong statistic by constructing it using
observation-level loglikelihoods.
Thank you.
Regards,
Yashree