Currently, the presence of data outliers can create an undesirable fit. Because the outlier lies far away from the true pattern of data, it induces error to the true fit. A workaround to this problem would be to minimize the weight(s) of such outlier(s).
MATLAB: What Weighted-Least-Squares Fitting capabilities are available in MATLAB 6.1 (R12.1) and the Toolboxes
Curve Fitting Toolboxfitlinearnonnonlinearoutliersregressionrobustweighted
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