Curve fitting for Mac?

Dietmar Tietz Dietmar.Tietz at agrar.uni-giessen.de
Wed Oct 12 10:27:33 EST 1994

On 12 Oct 1994, Nigel Eastmond wrote:

> I am trying to find a curve fitting program for the Mac.  I have CA-Cricket
> Graph III which creates nice graphs for publication but is not very
> scientifically orientated in the fitting department.  I have had a fiddle
> with Biosoft Ultrafit which is nice but does not produce a graph of the 
> curve.  What I really need is a program or a combination of programs which
> will allow me to use data to generate scatter plots on standard and log
> axes with curve fitting for Scatchard, Langmuir etc. fits.  The graphs
> really have to have the capability of making CA-Cricket style publication
> quality graphs.
> Perhaps the solution is a program which fits the curve and generates an 
> equation of it.  Then I could use a BASIC compiler to generate dummy points
> for the curve.  This data could be superimposed on the CA-Cricket data
> and plotted.  The original data would remain unplotted and the net result
> would be the appearance of a curve fit.  Tra-la!
> Gosh, In my rantings, I have nearly solved the problem.  So what I need is 
> an equation generating biologically orientated fitting program.  Ultrafit
> doesn't seem to give you an equation.  Am I missing something?
> o------------------------------oOo------------------------------o
> | Nigel C. Eastmond             |   Email nce at rri.sari.ac.uk    |
> | Rowett Research Institute     |   Tel   +44 244 712751        |
> | Aberdeen                      |   Fax   +44 244 715349        |
> | Scotland                      |                               |
> o------------------------------oOo------------------------------o
The program you are probably looking for is MacCurveFit.  It is shareware
and available on Gopher.  Use Veronica to search for maccurvefit1.07
This program allows you to fit standard functions or any function of
your own as long as it is defined in the range of your data.  It provides
plots to show the goodness of fit, although the graphs may not have all
the convenient features of CricketGraph.  The fitted parameters are 
computed with standard errors.  You also get some other statistical
output.   If you want something more fancy, then you have to stick to
commercial programs like Maple IV, Mathematica, Matlab, etc.  


Dietmar Tietz

*           Dietmar Tietz, Ph.D.,  Research Scientist            *
*            Biostatistics, Justus-Liebig-University             *
*            Ludwigstr. 27, D-35390 Giessen, Germany             *
*                  Phone: +49-(641)-702-9733                     *
*                   Fax: +49-(641)-702-9724                      *
*              Email: Dietmar.Tietz at Uni-Giessen.de               *

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