Nonlinear least square regression

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ameen 2013-5-23

Hi all i have 17 observation (x and y) the relation between them as follows

y = 0.392 * (1 - (x / J)) ^ i

i want to use nonlinear least square regression to know J and i

Thanks in advance

Eli Duenisch 2013-5-23

编辑：Eli Duenisch 2013-5-23

Do you have the statistics toolbox installed? It supports nonlinear regression - look for NonLinearModel.fit() in the docs.

ameen 2013-5-24

thank you for your kind reply but i put my x values, then my y values, and put beta0=[0.65,1.1] then i write

mdl=nonlinearmodel.fit(x ,y ,'y=0.392*(1-x/b1)^b2',beta0)

and i received error message ' Undefined variable "nonlinearmodel" or class "nonlinearmodel.fit".'

Tom Lane 2013-5-24

Try NonLinearModel.fit capitalized just that way. This should work in the most recent releases of MATLAB. Otherwise try nlinfit.

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