The set method command allows the user to select the fitting method to be used when calling the fit command. The following methods are available:
NAME DESCRIPTION ---- ----------- ls_reg least square linear regression (2 parameters) lad_reg least absolute deviation linear regression (2 parameters) ls_fit general least square linear fit using QR decomposition svd_fit general least square linear fit using singular value decomposition ml_fit general least square nonlinear fit using Marquardt-Levenberg method
Among them, only ml_fit and ls_fit depends on iteration and adjust.
For all methods except lad_reg, the value of χ2 will be put in the scalar constant chi2. In the case of lad_reg, will contain the average absolute deviation.
set method method
set method svd
fit, set iteration, set function