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2013 Mar 05
0
Error message from flexsurvreg
I'm working on a survival analysis project and, based on previous work of my colleagues on similar projects, am trying to estimate an AFT model with a generalized gamma distribution. When I execute the following code: >flexsurvreg(timesurv ~ cycles + rcycle + cyctime, dist="gengamma") I get the following error message: Error in optim(optpars, minusloglik.flexsurv, t = Y[, "time"], dead = Y[, : non-finite finite-difference value [4] I get an almost identical error (a 3 in the brackets instead of a 4) if I use...