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mmicman
2010 Apr 12
0
How to derive function for parameters in Self start model in nls
Dear all
i want to fit the self start model in nls. i have two question. i have a
function,
(asfr ~ I(((a*b)/c))+ ((c/age)^3/2)+ exp((-b^2)*(c/age)+(age/c)-2)
i am wondering how to build the selfstart model. there is lost of example,
(i.e. SSgompertz, SSmicman, SSweibull, etc). my question is, how to derive
the function of parameters. and also which model to use for get
the initials values. In the following example's the red color coding
requires the explanation??
thanks
SSgompertz
function (x, Asym, b2, b3)
{
.expr2 <- b3^x
.expr4 <-...