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Restrict profiles in Choice Design

Hi,

I'm doing a 2-profile choice set design. How do I restrict/eliminate certain combinations of attributes (i.e., certain profiles) from appearing in the choice sets? A related thread (http://support.sas.com/forums/thread.jspa?messageID=24495徯) alludes to using Prior Means and Prior Variance Matrix for this. However, it is not clear what value to provide in the prior variance matrix to eliminate a certain combination of attributes.

I'd really appreciate any help on this matter.

Thanks,
Srini