Metrohm viva 1.1 (ProLab) - Manual (Page 816)

6.8 Colorimetric sensors subwindow
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viva 1.1 (for process analysis)
NOTE
If the Wavelength and/or the coefficients c0 to c3 have been entered
manually, then the following parameters will be reset to the default
value or updated:
￭ Confidence interval = off
￭ Number of outliers = 0
￭ Coefficient of determination = invalid
￭ Calibration method = manual
￭ Calibration range = invalid
￭ Calibration date is updated
￭ Determination ID is deleted
￭ User is updated
Confidence interval
Shows the confidence interval within which the measured values for the
determination of the calibration curve must lie. Values outside this range
are called outliers, they are not integrated in the calculation of the calibra-
tion coefficient. If the Wavelength and/or the coefficients c0 to c3 are
entered manually, then off will be displayed.
Number of outliers
Number of outliers (values outside the confidence interval). If the wave-
length and the coefficients c0 to c3 were entered manually, then 0 will be
displayed.
Coefficient of determination
Shows the coefficient of determination (R 2 ), which is calculated on the
basis of the calibration function and the confidence interval. If the Wave-
length and/or the coefficients c0 to c3 have been entered manually, then
invalid will be displayed here.
R 2 defines the extent of dispersion of y (absorbance) that can be explained
by x (concentration). It lies between 0 and 1. The closer R 2 is to 1, the
more likely there is a linear dependency between x and y. If R 2 = 0, there
is no correlation. Five decimal places are displayed.
Calibration range
Minimum and maximum concentration of the calibration solution. In this
range, the calibration curve represents a monotonously ascending or
descending function. The value cannot be modified. It is defined from the
method and corresponds to the range between the first and last calibra-
tion points used.