please am very new in r statistics so any help will be appreciated. I conducted a discrete choice experiment that has 2 alternatives (A and B) with an opt-out option (C), each alternative have 6 attributes with 2 levels. I have 869 respondents. I used the dummy code 1 for the 1st level and 0 for the second level When I tried to run the analysis using the nested logit model, it came up with the issue of singularity, so I think there is something wrong with my dataframe.
My question is this, can anyone tell or show me how to prepare the data for multinomial logit regression analysis in R?