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Hi All, I am running a multivariate model where the variance-covariance matrix is individual-specific. The correlation structure is common for all individuals, while the variances vary across individuals. At some point I need to take the inverse of sigma[i,1:ntraits,1:ntraits] for each value of i, which apparently gives problems. Any suggestion to solve this one? many thanks Stefan Prof. Dr. Stefan Van Dongen Department of Biology - Group of Evolutionary Biology University of Antwerp Groenenborgerlaan 171 B-2020 Antwerp Belgium personal page: http://www.ua.ac.be/stefan.vandongen email: [log in to unmask] Tel: + 32 (0)3 265 33 36 Fax: + 32 (0)3 265 34 74 ------------------------------------------------------------------- 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