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..., plot(dose, y, las = 1)) fit <- drm(y ~ dose, fct = LL.4(), control = drmc(maxIt = 100000, relTol = 1e-4), data = d) # Error in optim(startVec, opfct, hessian = TRUE, method = optMethod, control = list(maxit = maxIt, : # non-finite finite-difference value [4] # Error in drmOpt(opfct, opdfct1, startVecSc, optMethod, constrained, warnVal, : # Convergence failed He cambiado un poco los parametros de control de la funcion drm, pero no ha sido efectivo. Alguna otra sugerencia?. Muchas gracias! Jorge.- [[alternative HTML version deleted]]

...177 1e+01 0.00 178 1e+01 0.00 179 1e+01 0.00 180 1e+01 0.00 m1 <- drm(Length ~ conc, data = dat, fct = CRS.4c()) Error in optim(startVec, opfct, hessian = TRUE, method = optMethod, control = list(maxit = maxIt, : non-finite finite-difference value [1] Error in drmOpt(opfct, opdfct1, startVecSc, optMethod, constrained, warnVal, : Convergence failed Thanks in advance Syamkumar R School of Environmental Studies CUSAT Kerala, India