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MathGroup Archive 2007

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Re: Curve-fitting/data analysis question...

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  • Subject: [mg73326] Re: [mg73311] Curve-fitting/data analysis question...
  • From: "Chris Chiasson" <chris at>
  • Date: Mon, 12 Feb 2007 05:04:47 -0500 (EST)
  • References: <>

make the cutoff point a parameter in your regression?

On 2/11/07, sherifffruitfly <sherifffruitfly at> wrote:
> Hi all,
> I've got some data that is approximately constant, c, over an
> interval, and then drops off like -(a exp(b x)).
> How can I determine when the constant part ends, and the negative
> exponential begins in Mathematica? I can eyeball it on a graph, but I'd much
> prefer to have a principled Mathematica routine settle the question. Once
> that's settled, it should be straightforward to determine the
> exponential's parameters via some curve-fitting routine or other.
> Thanks for any suggestions,
> cdj


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