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

*To*: mathgroup at smc.vnet.net*Subject*: [mg73326] Re: [mg73311] Curve-fitting/data analysis question...*From*: "Chris Chiasson" <chris at chiasson.name>*Date*: Mon, 12 Feb 2007 05:04:47 -0500 (EST)*References*: <200702110615.BAA11578@smc.vnet.net>

make the cutoff point a parameter in your regression? On 2/11/07, sherifffruitfly <sherifffruitfly at gmail.com> 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 > > > -- http://chris.chiasson.name/

**References**:**Curve-fitting/data analysis question...***From:*"sherifffruitfly" <sherifffruitfly@gmail.com>