Question: Model1O

Model1O <- nlme(circumference ~ Cmax/(1+exp(-r*(age-tmid))), + start = c(Cmax=200,tmid=100,r=0.4), + data = Orange, + fixed = Cmax+tmid+r ~ 1, + random = Cmax+tmid+r ~ 1) Error in MEEM(object, conLin, control$niterEM) : Singularity in backsolve at level 0, block 1

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