[R-sig-ME] Likelihood function of lme4
Ben Bolker
bbo|ker @end|ng |rom gm@||@com
Tue Apr 20 18:02:34 CEST 2021
OK. You should make sure to check that lme4 and frontier are
computing *commensurate* log-likelihoods (e.g. that the normalization
constants are consistently included in both packages); if possible (it
isn't always), it's good to try to fit *identical* models in both
package to make sure they give the same log-likelihoods. (You can't fit
an lmer model without a random effect, but you can re-evaluate its
likelihood with the RE variances set to zero.)
On 4/20/21 11:52 AM, Yashree Mehta wrote:
> 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
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