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MathGroup Archive 2007

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Curve-fitting/data analysis question...

  • To: mathgroup at smc.vnet.net
  • Subject: [mg73311] Curve-fitting/data analysis question...
  • From: "sherifffruitfly" <sherifffruitfly at gmail.com>
  • Date: Sun, 11 Feb 2007 01:15:33 -0500 (EST)

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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