## Curve Fitting

cecilia
Posts: 1
Joined: Wed Sep 23, 2015 9:44 am

### Curve Fitting

Goodevening,
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?
Thank you so much
Cecilia

OptimalDesigns
Posts: 4
Joined: Mon Jul 23, 2018 5:34 pm
Platform: PC
OS: 7
Location: Central Point, Oregon, USA
Contact:

### Re: Curve Fitting

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 fortranCalculus.info/apps/curvfit.html. Please download, install, and run some of its demo files. It's free and includes source files for modifying CurvFit as you like.

Phil
Last edited by OptimalDesigns on Fri Jul 27, 2018 12:53 am, edited 1 time in total.
One Step from 1st Principles to Solution!

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Joined: Tue Jun 19, 2018 4:14 am

### Re: Curve Fitting

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