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NonlinearRegression

• To: mathgroup at smc.vnet.net
• Subject: [mg25081] NonlinearRegression
• From: David Pires <l45337 at alfa.ist.utl.pt>
• Date: Thu, 7 Sep 2000 22:28:31 -0400 (EDT)
• Organization: Universidade Tecnica de Lisboa
• Sender: owner-wri-mathgroup at wolfram.com

I want to fit my data with a function such as:
f(x)=Sqrt(a-b*x), where a and b are the parameters I want to adjust and x
is the variable. The problem is that there is only a given range of x for
that f(x) has real values. When I use the NonlinearRegression (or
NonlinearFit) command, Mathematica gives error messages and aborts the
fitting process. 

I'd like to know if someone knows how to set the range of x when using
that command. 
Thanks.