Question: Model1O

Model1O <- nlme(circumference ~ Hmax/(1+exp(-r*(age-tmid))), + start = c(Hmax=60,tmid=11,r=0.2), + data = Orange, + fixed = Hmax+tmid+r ~ 1, + random = Hmax+tmid+r ~ 1) Error in chol.default((value + t(value))/2) : the leading minor of order 2 is not positive

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