Hello Everyone,

I am working with a "labelled" DCE which has 20 choice sets, 4 alternatives with 6 attributes. Each respondent answers 4 choice sets.

I have my data in long form (Respondent_ID, alternatives, attributes.....) such that Respondent_ID 1 has 16lines for 4 choice sets with 4 alternatives. When i cmset this data

cmset Respondent_ID alternatives : I get an error "at least one choice set has more than one instance of the same alternative r(459);" which i guess is understandable as 1 Respondent ID has multiple alternatives but in my case 1 RespondentID has answered 4 choice sets.

How should i format the data to work in this case? I have seen multiple videos in youtube and stata manual but they all had only 1choice set per respondent.

1 additional question:

I have 4 "labelled" alternatives A,B,C,D (with A being the base option)

based on the choice scenario i ask to pick the best choice among the four, but also gave a 5th option of "I will pick A but i will consider C or D if the cost is lower" (cost is one of the attributes).

How can I add this 5th option in my analysis?

Thanks a lot.