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Hi list! I'm getting an error message when trying to fit an accelerated failure time parametric model using the aftreg() function from package eha: > Error in optim(beta, Fmin, method = "BFGS", control = list(trace = > as.integer(printlevel)), : > non-finite finite-difference value [2] This only happens when adding four specific covariates at the same time in the model (see below). I understand that kind of problem can come from a too high correlations between my covariates, but is there anything I can do to avoid it? Does somet...

...; > Hi list! > > > I'm getting an error message when trying to fit an accelerated failure > time parametric model using the aftreg() function from package eha: >> > Error in optim(beta, Fmin, method = "BFGS", control = list(trace = >> > as.integer(printlevel)), : >> > non-finite finite-difference value [2] > This only happens when adding four specific covariates at the same time > in the model (see below). I understand that kind of problem can come > from a too high correlations between my covariates, but is there > anything I ca...