Full_Name: Ken Kelley Version: 2.1.1 OS: Windows XP Submission from: (NULL) (156.56.79.54) A warning from optim() when reltol was specified for the L-BFGS-B method: "method L-BFGS-B uses 'fact' (and 'pgtol') instead of 'reltol' and 'abstol' in: optim(par = LL.0, fn = Low.Lim.NC.F, gr = NULL, method = c("Nelder-Mead"," But, "fact" should be "factr," which is the name of the control parameter or interest.