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Alternatives(1) - An amplification of SegReg permitting expression of preference for a certain type or of wish to exclude a certain type can be downloaded from SegRegA (2) - A different version of SegReg, called PartReg has been developed with the aim to detect the largest possible horizontal stretch in Type 3 and Type 4 relations. This has been done to find the maximum tolerance (or "no effect" reach of the dependent variable (e.g. crop yield) for changes in the dependent variable (e.g. soil salinity or depth of the water table). Download PartReg with this link See the figures below to appreciate the diffrence bteween SegReg and PartReg. The first minimizes the deviations of the model values from the observed ones over the entire domain, whereas the second detects the maximum part of the domain over which the regression coefficient (i.e. the slope of the regression line) can be taken equal to zero. For more examples see this article on page 13 and following. |

Introduction screen SegReg program: Example Type 3: SegReg is designed for segmented (piecewise) linear regrssion with breakpoint (threshold). It can be used for salt tolerance of crops or the tolerance to shallow watertables. It clarifies the crop response and demonstrates the resistance to high soil salinity or water level. Example Type 3 with extended horizontal line using the same data as above in the PartReg software application. instead of SegReg. The salt tolerance of mustard is almost ECe=8 dS/m. After the threshold the yield reduces. In other words, the crop resists salinity up to 8 dS/m while up to 8 dS/m there is no negative effect. |
Example Type 4: The crop tolerates a depth of the water table
of 7 dm.
Example Type 5: In year 9 (1976) a dam was contstructed in the
river |

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