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> The BUGS program below is meant to implement a slightly simplified > version of the Press-Shigemasu Factor analysis for 4 variables, 2 > independent priors. I get the error message "unable to choose update method > for psi(1,1)", which according to the manual indicates a restriction has > been violated. But I don't see it. Perhaps I am blind but conditionally > everything looks normal or Wishart. Like everyone else, I would be > extremely grateful for any help!!! > > I'm afraid this comes under Section 9.1(c) of the manual, restricting Wishart nodes to have to be conjugate to MVN. In your model psi is both the precision of an MVN and hence can be given a Wishart prior, but also appears as influencing a mean of an MVN. Hence it cannot be updated. Section 8.6 of Peter Congdon's book may help (see http://www.mrc-bsu.cam.ac.uk/bugs/weblinks/webresource.shtml ) David ------------------------------------------------------------------- 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