BUCHI NIRCal User Manual
Page 51
Chemometrics
NIRCal 5.5 Manual, Version A
51
SIMCA Overview Plot
The Overview plot is automatically opened after the SIMCA calculation is finished. Each calibration
has the name:
SIMCA + substance name (property name) selected for the calibration.
The Overview plot contains the following plots:
Plot name
Description
1
Pretreated
Spectra
using the same pretreatment, as the cluster calibration
2
scores
against PCs
scores against the PCs for each spectra in the project
3
scores vs.
scores
in this score plot the calibrated substance is around the center (Mean
Centering distance is calculated for only the C-set spectra), each other
spectra, which are not in the calibration, have normally huge score values
4
spectra
residual
the residuals of the calibrated substance spectra are normally smaller, as
each other substance residuals
5
residuals vs.
leverages
the so-called Coomans plot shows the residuals against the leverages
(leverage is the direct distance of a spectrum in the score plot from the
centrum)
6
NIR-Explorer
For a SIMCA calibration the limits are also called:
Residual : outer model distance;
Leverage : inner model distance.