SegRegA :   Fitting of logistic S-curves or sigmoids with confidence belt to crop data.
Totally free download of software

Summary:
The amplified SegReg computer program (model), SegRegA, originally designed to perform a
segmented (piecewise) linear regression, has been given the possibility to fit quadratic parabola's,
cubic functions, and sigmoid S-curves to agricultural crop data, (see list of publications in which SegReg is used).
The cubic functions are determined by matrices, determinants and matrix inversion.

Screenprint:

screenprint
         SegReg for S-curve preference

Download:
SegReg
standard

Download:
SegRegA
amplified

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Example of an S-curve model for crop yield and depth of the water table:

yield of barley
         and soil salinity


Example of an inverted S-curve model for crop yield and soil salinity :

yield of barley
         and soil salinity


Example of a cubic regression applied to crop yield and soil salinity yielding an S-curve :

a cubic 
         regression based in inverted matrix


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