Dear users,

I am using the stata command of mixlogitwtp by Hole(2016) in my choice data. However, I had some difficulties. When I included the constant (opt-out option) to the command, it did not work. What can be the problem? Also, I would like to compare the WTP of attributes for two experiments. I created a dummy variable (0 1) and test the treatment effect. However, it did not work. I would be very glad if you can help me.

Thank you
Ozge