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Re: Asking NonlinearRegression
*To*: mathgroup at smc.vnet.net
*Subject*: [mg88781] Re: Asking NonlinearRegression
*From*: dh <dh at metrohm.ch>
*Date*: Fri, 16 May 2008 05:33:25 -0400 (EDT)
*References*: <g0h4kd$la4$1@smc.vnet.net>
Hi Navri,
NonlinearRegression as well as FindFit (should be used instead of the
older NonlinearFit) seem to work as expected:
fun=Exp[(1-Exp[a*(1-Exp[-b*x])])*(Exp[-b*x])/(1-Exp[-b*x])];
d1={1,0.00,2,0.00,3,0.00,4,0.00,5,0.00,6,0.00,7,0.00,8,0.00,9,0.00,10,0.00,11,0.00,12,0.00,13,0.00,14,0.00,15,0.00,16,0.00,17,0.00,18,0.00,19,0.00,20,0.00,21,0.00,22,0.00,23,0.00,24,0.00,25,0.00,26,0.00,27,0.00,28,0.00,29,0.00,30,0.00,31,0.00,32,0.00,33,0.00,34,0.00,35,0.00,36,0.00,37,0.00,38,0.00,39,0.00,40,0.00,42,0.00,44,0.00,46,0.00,48,0.00,50,0.00,52,0.04,54,0.06,56,0.08,58,0.09,60,0.16,65,0.24,70,0.32,75,0.43,80,0.49,85,0.58,90,0.80,95,0.91,100,1.00,105,1};
FindFit[d1,fun,{a,b},x]
NonlinearRegress[d1, fun, {a, b}, x]
Could it bee that you had a syntax error?
hope this helps, Daniel
Navri Navri Bintang wrote:
> Hi,
>
> I have a problem with nonlinear regression in Mathematica. I want to fit my data (below) to this following equation:
>
> y = Exp[(1-Exp[a*(1-Exp[-b*x])])*(Exp[-b*x])/(1-Exp[-b*x])]
>
> and I would like to find a and b values and also determined r-squared value.
>
> I try to use NonlinearRegression/NonlinearFit code, but its not working, I hope someone could help me
>
> Thanks a lot
>
> DATA:
> x y
> 1 0.00
> 2 0.00
> 3 0.00
> 4 0.00
> 5 0.00
> 6 0.00
> 7 0.00
> 8 0.00
> 9 0.00
> 10 0.00
> 11 0.00
> 12 0.00
> 13 0.00
> 14 0.00
> 15 0.00
> 16 0.00
> 17 0.00
> 18 0.00
> 19 0.00
> 20 0.00
> 21 0.00
> 22 0.00
> 23 0.00
> 24 0.00
> 25 0.00
> 26 0.00
> 27 0.00
> 28 0.00
> 29 0.00
> 30 0.00
> 31 0.00
> 32 0.00
> 33 0.00
> 34 0.00
> 35 0.00
> 36 0.00
> 37 0.00
> 38 0.00
> 39 0.00
> 40 0.00
> 42 0.00
> 44 0.00
> 46 0.00
> 48 0.00
> 50 0.00
> 52 0.04
> 54 0.06
> 56 0.08
> 58 0.09
> 60 0.16
> 65 0.24
> 70 0.32
> 75 0.43
> 80 0.49
> 85 0.58
> 90 0.80
> 95 0.91
> 100 1.00
> 105 1
>
>
> Rgds,
> Navri
>
>
>
>
>
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