SegRegA :   segmented regression with breakpoint as well as generalized S-curve, quadratic and cubic functions.
Totally free download of software

Summary:

The SegRegA computer program (calculator) is designned to perform a segmented regression analysis, but in addition it offers the opportunity to apply S-curve, quadratic and third degree regressions.
The last three have an increased versatility by applying an exponential transformation of the data by assuming a range of exponents and selecting the one that produces the best fit. Thus, the exponent is optimized.
The cubic regression uses the technique of inversed matrices and determinants to obtain the least squares result.


Experiences: For improvement, I am interested to learn about your experiences with SegRegA.
For this there is a contact form.


                        Screenprint of SegRegA showing the regression options.
                        screenprint of
         SegRegA

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SegRegA

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                                                Examples of generalized cubic regressions :

wheat yield
              and soil salinity
wheat yield
              and soil salinity

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