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I am trying to optimize a likelihood function using constrOptim. I know from prior research that, e.g. x1>x2. Is there a way to include that constraint into the optimization routine, i.e. the ci constraint? The examples I...
Hello, I need a little initial help with the MNP package. I am trying to analyze a discrete choice experiment with the following settings: - choice sets consist of 3 alternatives - choice alternatives are constructed by e.g. two attributes, say...
Dear R users, I am trying to estimate a nested logit model that has a constant option in a degenerate partition. The data set is a conjoint survey where respondents were asked to answer multiple choice sets. The choice sets...
Thank you for your answers and suggestioins! I just read a tutorial on the use of SAS with Discrete Choice Models by Warren Kuhfeld ("Marketing Research Methods in SAS", 2004, free for download). He suggests using the Cox PH model...
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