Hi Community. I'm working on a discrete choice experiment with 3 factors with 2 levels each = 8 designs. I want to fully know the interaction between the factors and subject preference. I think a 28-set design of two alternatives each would be suitable: I want to confront the 8 designs to each other (8 C 2), like a football league of 8 teams everyone versus everyone. I'm new in SAS and I'm not sure how to develop this procedure. I'm following SAS Technical Support Documents--Marketing Research and I tried this code: %mktruns(2 ** 3) %mktex(2 ** 3, n=8) proc print data=design(obs=8); run; %choiceff(data=design, /* candidate set of alternatives */ model=class(x1-x3 / sta), /* model with stdzd orthogonal coding */ nsets=28, /* number of choice sets */ maxiter=8, /* maximum number of designs to make */ flags=2, /* 2 alternatives, generic candidates */ options=relative, /* display relative D-efficiency */ beta=zero) /* assumed beta vector, Ho: b=0 */ proc print; by set; id set; run; %mktdups(generic, data=best, nalts=2, factors=x1-x3) But I get duplicated sets. I want each factor to appear 7 times in the experiment. I would like to learn some suggestions from you. Thank you very much in advance. Ambrosio.
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