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addbar
2011 Apr 04
1
Deriving formula with deriv
Dear list,
Hi,
I am trying to get the second derivative of a logistic formula, in R summary
the model is given as :
###
>$nls
>Nonlinear regression model
>model: data ~ logistic(time, A, mu, lambda, addpar)
>data: parent.frame()
> A mu lambda
>0.53243 0.03741 6.94296
###
but I know the formula used is
# y~'A'/(1+exp((4*'mu'/'A')*('lambda'-'time'))+2)) # from the grofit (
package I am using to fit the model) documentation.
I have at...