Nonlinear regression initial parameter estimates

Question

Ken W 2015-12-14

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https://ww2.mathworks.cn/matlabcentral/answers/260226-nonlinear-regression-initial-parameter-estimates

回答： Ken W 2015-12-16

Dear all,

Attached is my data for nonlinear regression. I need help to get the initial parameter estimates. The model is

Y = AX/((1+BX)^C)

What is the initial parameter estimates which will be used in nonlinear regression? How to get the initial parameter estimates?

Thank you.

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Torsten 2015-12-14

编辑：Torsten 2015-12-14

By trial-and-error.

For a set of parameters (A,B,C), I usually plot the curve together with the data. Then I try to adjust the parameters such that the curve fits the data reasonably well and call the nonlinear regression solver with these parameters as starting guesses.

By the way: You forgot to attach your data.

Best wishes

Torsten.

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