Real time, 69 real time – BUCHI NIRCal User Manual

Page 194

NIRCal 5.5 Software Manual

194

NIRCal 5.5 Manual, Version A

Q-Value V5:

Q = 1 / ( 1 + sum (weights * value))

NOTE
The weights are changed between the NIRCal 4.21 Q-Value calculation weights, so the NIRCal 5 Q-
Values are differing against NIRCal 4.21.

The Q-Value calculation is not changed for the Cluster calibration between NIRCal 4.21 and NIRCal
5.

Explanation of the Q-Value calculation of qualitative calibration:

General term

Aspects of a good
calibration

Weights

C-Set false identified

Should be zero (indicates
wrong user settings)

C-Set not identified

Should be zero (indicates
wrong user settings)

V-Set false identified

Should be zero (indicates
wrong sample or calibration)

V-Set not identified

Should be zero (residual or
distance problem)

Cluster Index “Number of
Clusters”

“Number of C-Set Properties”:
should be zero

Property Uniformity

Should be small: the spectra
spreading in the clusters is
uniform

Property Interference

Should be small: the clusters
are independent from each
other

0.1

w : weights
v : value
n : number of aspects

The Q-Value is normally high for CV and SIMCA calibrations, while a quantitative calibration with
Cross Validation has empty V-Set (Weighted Accuracy = 0), a qualitative calibration using
SIMCA has no neighboring substance (single property calibration: property interference = 0).

3.18.69

Real time

Description

Contains the real time of the spectra creation time in seconds.

Use

For 1D-scatter and dependency plots.

Method

PCR / PLS / Cluster (CLU) / SIMCA / MLR

Matrices ID

Tip

Details

Real time is a column vector.