I am trying to figure out the new choice model (cmset) analysis for results of the discrete choice experiment (DCE).

I have a panel data set with unlabeled alternatives: that is my respondents saw two options per choice-set, there were no alternative specific variables, the attribute-levels varied across choice sets. Each respondent saw 12 choice sets.

How do I run this command9CMset) with unlabelled choice tasks? I would like to use the cmclogit and cmmixlogit.
So far I tried:
cmset id scenario(the 12 choice sets), noalternatives
cmset id gr-var, no alternatives

Also, is there an option for latent class analysis under cmset ?

Thank you.
Kind regards,
Elena