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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[,