BUCHI NIRCal - Manual (Page 171)

Chemometrics
NIRCal 5.5 Manual, Version A 171
It is possible, that different numbers of PCs are ideal for a certain parameter. In this situation the
different secondary PCs should be selected, the calibrations recalculated and compared.
Very low consistency indicates an overfitting (too many secondary PCs used).
3.18.7 Correlation Spectra
Description Called also as synchronous 2D correlation spectra.
Use Shows the correlating spectra.
Method PCR / PLS / Cluster (CLU) / SIMCA / MLR
Matrices ID 96
Tip See Top view or 3D-surface plot. Pretreatments have influence (press F5
after changing pretreatments).
Details Cw = X’X = Transpose(X) * X
X = pretreated spectra
Related Topic Correlation Wavelength
3.18.8 Correlation Wavelength
Description Called also as synchronous 2D correlation wavelength.
Use Shows the correlating wavelengths.
Method PCR / PLS / Cluster (CLU) / SIMCA / MLR
Matrices ID 97
Tip See Top view or 3D-surface plot. Pretreatments have influence (press F5
after changing pretreatments).
Details Cw = XX’ = X * Transpose(X)
X = pretreated spectra
Related Topic Correlation Spectra
3.18.9 Creator
Description Contains the creator / user index.
Use For 1D-scatter and dependency plots.
Method PCR / PLS / Cluster (CLU) / SIMCA / MLR
Matrices ID 106
Tip
Details Creator index is a column vector.
Related Topic
Description
Contains the creator / user index.
Use For 1D-scatter and dependency plots.
Method PCR / PLS / Cluster (CLU) / SIMCA / MLR
Matrices ID 107
Tip
Details Creator index is a row vector.
Related Topic