terbuthylazin.m1 <- drm(rgr~dose, data = terbuthylazin, fct = LL.4())
diagnostics(terbuthylazin.m1)
terbuthylazin.m2 <- drm(rgr~dose, data = terbuthylazin, start=c(1,0.01,0.38,130), fct = LL.4())
diagnostics(terbuthylazin.m2)
## the start values given result in faster convergence
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