Curve Fitting

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Curve Fitting

Post by cecilia » Wed Sep 23, 2015 9:59 am

I'm an Italian student and I'm working on Curve Expert because of my thesis on Learning and Forgetting Curve in Management Engineering.
I have a few questions about Curve fitting.
I need to find the best Curve that fits my dataset based on number of units produced(x axis) and assembly times required for each unit( y axis) in order to find the rate of improvement of the worker who performed that task.
First of all I would like to find the parameters "a" and "b" for example when I have a Power Curve my "b" parameter should be -1<b<0. Is it possible to establish a constraint like that?
Secondly when i fit the curve it appears a curve's graph with some details; for example the "S" value on the top-right side what's stand for? and the r value?
Waiting for an answer
Thank you so much

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Re: Curve Fitting

Post by OptimalDesigns » Mon Jul 23, 2018 6:26 pm

With the Lorentz (function) where y = 1/(1+x*x), one can fit data to a wide variety of data. There is a Windows App called 'CurvFit' that has an option of a Lorentzian or Modified Lorentzian series; Sine & Damped Sine; and other series. Visit Please download, install, and run some of its demo files. It's free and includes source files for modifying CurvFit as you like.

Last edited by OptimalDesigns on Fri Jul 27, 2018 12:53 am, edited 1 time in total.
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Re: Curve Fitting

Post by abc1234568 » Thu Jul 26, 2018 10:26 pm


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