Metrohm Vision – Tutorial - Manual (Page 18)

1.2 Sample Selection 
NIRS Vision Tutorial – Operation 
11
Vision now performs calculations according to the parameters defined in the
previous steps.
Figure 1 Result Sample Selection for qualitative Analysis
1 Math treated spectra 2 Frequency versus Probability
3 Sample location in 2D
Principal Component
Space 4 Explained Variance
Color Code:
 Dark blue = Training Set;
samples determined to be suitable for library development.
 Light blue = Acceptance Set;
samples suitable for library development but which are redundant
compared with those in the Training set. The Acceptance set is used for
Validation of the Library.
 Red = Rejected;
samples determined to be unsuitable for library development because they
differ significantly from those in the Training and Acceptance sets.
Since we know, that the samples contain only the desired variance, the
Frequency versus Probability box should not show rejected samples (red boxes).
Save Results
1. Click on Select  Save Results
2. If asked “Do you need to Save previously selected samples?” click on
[YES]
3. If asked “Do you want to save redundant samples as Acceptance
Set?” click on [YES]
The color of the cuvette next to the product name turns red.