[R] Relative constraint using constrOptim?

2006-10-06 Thread Felix Eggers
I am trying to optimize a likelihood function using constrOptim. I know from prior research that, e.g. x1x2. Is there a way to include that constraint into the optimization routine, i.e. the ci constraint? The examples I found only use absolute numeric values for the constraint and not

[R] MNP - discrete choice experiment

2005-12-15 Thread Felix Eggers
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 brand and price. - brand has three levels and

Re: [R] choice-based conjoint

2004-04-01 Thread Felix Eggers
Logit - some one wrote a free routine that converts Ken Train's GAUSS code to Ox. Afraid I don't have time to look up the website addresses. Hope this helps, Stephen Stephen Kay Head of Statistics Adelphi Group Products www.adelphigroup.com -Original Message- From: Felix

[R] choice-based conjoint

2004-03-31 Thread Felix Eggers
Hello everyone, I am new to this list and the R-Project, so I hope my question is not trivial or has been answered before. I searched the FAQs and the mailing list archives and I could not find anything about Conjoint Analysis. I am especially interested in Choice-based Conjoint, resp. discrete