In the Multilevel model, meglm is responsible for many linkage functions and families, but not for the link(identity) and family(Poisson). Why this option is not supported in meglm as is supported in glm? Even in menu-driven, there is no ratio button option allowing for selection by clicking. If this command is not allowed how do I manipulate my data for this objective?

I try to regress the same command with the same dataset in R via lme4 package [glmer]. I found that lme4 allows for this option too.

Thank you for all your advice.