A Study over Transformations of the Parameters of Richards Growth Model into the Biologically Meaningful Parameters

In this study, it is explained how the Richards model, which one of sigmoid growth models, transformed into a mechanical model with biologically significant parameters such as maximum value, lag time and specific rate. Detail transformations containing 4 calculated help first second derivatives were given. order to test accuracy prediction values analyzed by using height data E. Camaldulensis Dehn tree years. The estimated compared modified Gompertz, Logistic Bertalanffy models other 3 parameters. Error Sum Squares, Coefficients Determination Akaike Information Criteria used evaluation criteria for all proposed was concluded that 4-parameters predicted relatively better than models.