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Hello, I have been modelling alcohol-realted mortality using hierarchical spatial models, namely the Besag, York and Mollie model. This involves the car.normal prior. Is it ok to use Andrew Gelman's pV as a substitute for pD when calculating DIC for hierarchical models? My pD values are negative in some cases, but using the pV models results in much more sensible model selection. Ideally I would continue to try more models to find one which wouldn't result in a negative pD, but unfortunately I'm very low on time. Any advice would be really appreciated. Kind regards Emma Robinson ------------------------------------------------------------------- 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