Non-linear Rgression

*To*: mathgroup at smc.vnet.net*Subject*: [mg71580] Non-linear Rgression*From*: "aminr" <amin67r at gmail.com>*Date*: Fri, 24 Nov 2006 01:17:00 -0500 (EST)

Hello, I'm a physics student.I have done an experiment .I want to use Mathematica , I found a problem in using it : for example I have data ={ {0,0},{1,2},{3,6}} and I want to fit them for a equation such as " y=Log[Cosh[a*x]] " so I want the value of parametre"a" and also its error(i.e. a=0.045+- 0.05 then error is 0.05 ) and also the regression (i.e. R=0.995 ) please ,please , tell me how I can do it ? I have seen the help browser but i did'nt understand. could you please possibly try it and send me the programme.