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This drop-down menu allows you to choose from two methods to fit a seasonally adjusted von Bertalanffy growth model.


seasonal options


Choose Seasonal to fit the model using the Levenberg-Marquardt Method for non-linear regression. This is the preferred method as it will produce the most accurate estimates.


The Linear Seasonal method may be useful for diagnostic purposes should the Levenberg-Marquardt Method fail to reach a solution. Growth II estimates the initial guesses of the parameters for fitting the curve by the Levenberg-Marquardt Method using this linear approximation.