Metrohm Vision – Tutorial Instrukcja Użytkownika Pobierz pdf (Strona 26)

1.6 Multilinear Regression 

NIRS Vision Tutorial – Operation  19

Perform Sample Selection

1. Click on Select  Apply Math.

2. In the Edit Sample Selection Parameters dialog box enter the

following settings:

 Selection Method Mahalanobis Distance in Principal Component

Space

 Math Treatment 2nd derivative

 Leave all other settings unchanged

3. Click on [OK].

4. In the Edit Math Properties dialog box in the Principal Components

ID Parameters tab set the following wavelength regions:

 Region 1

Minimum: 416

Maximum: 1080

 Region 2

Minimum: 1120

Maximum: 2484

 Cum Var. 95 %

 Click on [OK]

5. In the Edit Math Properties dialog box in the 2nd derivative tab set

the following values:

 Segment: 10

 Gap: 0

6. In the Sample Selection Options dialog box apply or confirm the

following settings:

 Find Outliers enabled

 Outlier Threshold 0.95

 Threshold Type Probability Level

 Find Redundant enabled

 By number of samples enabled

 Training Set 75 %

 Acceptance Set 25 %

 Click on [OK]

Vision now performs calculations according to the parameters defined in the

previous steps.

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Metrohm Vision – Tutorial Instrukcja Użytkownika Strona 26