PiscesLogoSmallerStill Initial parameter dialog incremental data

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If you choose to fit a Richards curve to incremental data, Growth II will ask you to enter an appropriate value for the parameter that fixes the point of inflection.

 

Rich Param

 

 

If you do not want a value of 0.5 (the default) click on the number and type in the required number. This dialog gives you some guide values - for example, if a value of 1 is entered you will in fact be fitting the Gompertz. It is worthwhile examining the shape of your curve to decide if the shape is closer to a logistic von Bertalanffy or Gompertz in shape and then chose a shape parameter value close to that of the appropriately shaped curve.