ApolloChoiceModelling forum

I have a SP experiment conducted in two cities in US. I want to analyze it in a single model to understand how/whether preferences vary between cities. I tried SP-RP example given in the code, but it shows an error in apollopanelProd, that panel data structure is not present. It is not the panel data referred in the example because obviously there are different respondents. How can we run the analysis in such case?

Hi

that error should only appear if you only have a single observation per person. Do you have multiple observations?

Can you show us the code?

Thanks

Stephane