Question: fmOrange = nls(circumference ~ Cmax/(1+exp(-r*(age-tmid))), + start= c(Cmax=200, tmid = 100,r=0.05), + data = Orange) Error in nls(circumference ~ Cmax/(1 + exp(-r * (age -

fmOrange = nls(circumference ~ Cmax/(1+exp(-r*(age-tmid))), + start= c(Cmax=200, tmid = 100,r=0.05), + data = Orange) Error in nls(circumference ~ Cmax/(1 + exp(-r * (age - tmid))), start = c(Cmax = 200, : singular gradient

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