How many iterations does it run? GLIMMIX defaults to 20, and then says no convergence. You may want to add an NLOPTIONS statement to increase the maximum number of iterations - such as NLOPTIONS maxiter=1000:   Not sure if that is the issue, but it would be the first thing I would try.   SteveDenham ... View more

Well, you could consider the total as an offset for a count variable.  Just a thought about this though, if you put in 10, and only recover 1, and it is alive, that doesn't give me a lot of confidence that if I could have recovered all 10, then all 10 would be alive. And that is the assumption if you plug this into a binomial (or proportion) analysis.  Perhaps better to just analyze the counts of found alive, and if available, the number found dead.   SteveDenham ... View more