update.nlme
object
nlme
update(object, model, data, fixed, random, groups, start, correlation, weights, subset, method, na.action, naPattern, control, verbose)
fm1 <- nlme(weight ~ SSlogis(Time, Asym, xmid, scal), data = Soybean, fixed = Asym + xmid + scal ~ 1, start = c(18, 52, 7.5)) fm2 <- update(fm1, weights = varPower())