Dear Winbugs/Bugs users. I am faced with the following problem: I have been using Winbugs with the following code (for generating bernoulli variables adding to one ) without any problem N1=7 x[1]~dunif(0,1) old[1] <- 1-x[1] for (i in 2:N1-1) {x[i]~dunif(0,old[i-1]) old[i]<-old[i-1]-x[i] } total <- 1-sum(x[]) for (i in 1:N1-1) {y[i]<-x[i]} y[N1]<-fin I have then tried to copy the same code in Bugs. However, each time I compiled it, I got the following message error.: "invalid parameter value must be fixed" Does anybody know what it means? Besides, does anybody aware of some compilation differences between Bugs and WinBugs. ? Sincerely yours Tregouet David Tregouet David INSERM U525 Epidemiologic and Molecular Genetics of Cardiovascular Diseases 6ème étage 91 bd de l'hôpital 75634 Paris Cedex 13 France Tél: 33-1-40-77-96-93 Fax: 33-1-40-77-97-28