4.
Process Modeling
4.6. Case Studies in Process Modeling


NonLinear Fit with NonHomogeneous Variances  This example illustrates the construction of a nonlinear regression model for ultrasonic calibration data. This case study demonstrates fitting a nonlinear model and the use of transformations and weighted fits to deal with the violation of the assumption of constant standard deviations for the errors. This assumption is also called homogeneous variances for the errors.  