Free Curve Fitting Software for 4 Parameter Equation

AI Thread Summary
A discussion on finding free software for fitting data into a four-parameter equation, specifically the generalized logistic function, highlights several options. While TableCurve is noted for its capabilities, it is not free. Users are directed to a resource for selecting curve fitting packages based on operating system and ratings, which offers a variety of free or shareware options. Additionally, methods for fitting data using the generalized logistic function can be found in a specific document. Python's scipy module is recommended for performing curve fitting, with resources available online for guidance. The conversation also mentions the CurveFit Tracer tool, which may assist in converting graph images into usable mathematical equations, particularly for vacuum tube operating curves.
Ledsnyder
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Is there a software(preferably free) that can fit data into a 4 parameter equation?

like the generalised logistic function
 
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TableCurve is great for the type of fitting you need, but it's not free... This is a good site where one can select operating system, rating etc. and look for curve fitting packages that are either free or shareware. There is a wide selection, so I am confident you will in high likelihood find what you need for free;

http://download.cnet.com/
 
free? you can do it in python using the scipy module (scipy.optimize)...google "scipy curve fit", you should even find examples.
 
Good source of information will span over many many years. Recently, I wanted to obtain a curve fitting equation from the given graph image / published graph. I felt so powerless to do so. This CurveFit Tracer may be helpful to some of you.
 
Me thinks that maybe 'CurveFit Tracer' could be used to turn vacuum tube operating curves into useable mathematical equations! Has anybody tried this?
 

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