How to fit experimental data of three variables with 3 mathematical equations with 10 parameters(Have some constrains)??

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I have expermental data for three variables and also have mathematical model with 10 parameters. I need to find out these parameters by curve fitting with some constraints. I tried all the functions like lsqcurvefit, lsqnonlin, fmincon etc. The problem is I am not able to get good fitting. Someone please help me to solve this.
  15 件のコメント
Alex Sha
Alex Sha 2024 年 1 月 20 日
@Torsten ER vs. tdata and EI vs. tdata simultaneously
Alex Sha
Alex Sha 2024 年 1 月 20 日
@Anil Kumar Mekala the values of al,bta,g, and p I given are all in the range of [0, 1].
If allow negative values, the result will be much better, even in log scale
Sum Squared Error (SSE): 69.3854274976025
Root of Mean Square Error (RMSE): 0.211033016869369
Correlation Coef. (R): 0.999978240096715
R-Square: 0.999956480666923
Parameter Best Estimate
--------- -------------
tr 9.96659032322083E-7
al 0.0846648203798804
bta 0.237167900797157
g -0.491630134017753
p 0.789887749532826
l1 156.797966147271
l2 14.9268893939603
l3 -4.61141192504551
o -11.1885890017952
In normal scale:
In Log scale:

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