how to fit data with this specified functional form?

*To*: mathgroup at smc.vnet.net*Subject*: [mg67495] how to fit data with this specified functional form?*From*: "newbie" <CPPandC at gmail.com>*Date*: Wed, 28 Jun 2006 03:52:11 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

Dear all, I wanna fit my data with the function x^b where b is the parameter to be determined. But mathematica just return me: Input[2]:= FindFit[data, x^b, b,x] "The Jacobian is not a matrix of numbers at {b} = {1.`}" Output[2]:= {b -> 1.} I tried to fit another data with the same function x^b, this problem dissapears, so I guess that's due to my data is quite linear? but...How to avoid this problem and get a proper fit with the function x^b ? Thanks for any ideas! Best Regards. Bryan