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All, I am looking for some reference(s) that talk about using a random coefficient for a dummy variable. Assume that some of the subjects are exposed to a stimulus in a test / control setting. Having a fixed coefficient for the stimulus dummy variable implies that we are constraining all the exposed subjects to respond similarly to the stimulus. Instead, I want to allow the stimulus responsiveness to vary across the exposed subjects by using a random coefficient for the stimulus dummy variable. I am trying to ascertain if this makes sense from a modeling perspective. Would appreciate any advice / references. Raghu ------------------------------------------------------------------- This list is for discussion of modelling issues and the BUGS software. For help with crashes and error messages, first mail [log in to unmask] To mail the BUGS list, mail to [log in to unmask] Before mailing, please check the archive at www.jiscmail.ac.uk/lists/bugs.html Please do not mail attachments to the list. To leave the BUGS list, send LEAVE BUGS to [log in to unmask] If this fails, mail [log in to unmask], NOT the whole list