Metrohm Vision Manual - Manual (Page 137)

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2. From the Edit Regression Method dialog box, select Partial Least Squares, desired math
pretreatments, and the wavelength region. In the Maximum Number of Factors field you can
specify the number of factors to be calculated. Click on OK when done.
Optionally enter the value for Wavelength Shift parameter (in nanometers). If the parameter is
different from 0, Vision will use its value to shift every spectrum in the calibration set left and
right along the wavelength axis. The resulting set of spectra, three times larger than the
original set, is used for calibration. Constituent values of the shifted spectra are identical with
these of the original spectrum.
3. In the Regression Treatment Properties dialog box define the wavelength regions, math
treatment parameters, and the validation method.