BUCHI NIRCal - Manual (Page 99)

Chemometrics
NIRCal 5.5 Manual, Version A 99
Y_SNV = (y
– mean(y)) / Sdev (Y)
Use
Reduction of baseline variations.
Type
The Calibration wavelengths are used when the pretreatment is added; the wavelength range can be
changed afterwards in the pretreatment that can be different from the calibration wavelength.
Variance Scaling
The spectra are divided by the standard deviation vector of the C-Set spectra. It is dependent on the
C-Set selection.
NOTE
NIRCal handles the changing of the C-Set spectra automatically (by a refresh F5 or recalculation) and
changes the the standard deviation and the result of the pretreatment. The standard deviation vector
is stored in the pretreatment, so it can be used in the predictor and application.
Use
Can increase baseline variations, can be good for particle size separation.
Type
This pretreatment is not depending on the calibration wavelengths.