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 > > > > >

**Follow-Ups**:**Re: Re: Asking NonlinearRegression***From:*"Thomas Dowling" <thomasgdowling@gmail.com>

**Re: Re: Asking NonlinearRegression***From:*"Thomas Dowling" <thomasgdowling@gmail.com>