Metrohm tiamo 2.4 Manual - Manual (Page 1444)

6.8 Subwindow Colorimetric sensors
￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
1428 ￭￭￭￭￭￭￭￭
tiamo 2.4
c3
Calibration coefficient third-order.
Input range -1E+99 - 1E+99 (max. 10 significant places)
Default value 0
NOTE
If the Wavelength and/or the coefficients c0 toc3 have been entered
manually, then the following parameters will be reset to the default
value or updated, respectively:
￭ 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
￭ Audit Trail entry ensues
Confidence interval
Display of 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
calibration coefficient. If the Wavelength and/or the coefficients c0 toc3
were entered manually, then off will be displayed.
Number of outliers
Total number of outliers (values outside the confidence interval). If the
wavelength and the coefficients c0 to c3 were entered manually, then 0
will be displayed.
Coefficient of determination
Display of 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 size of the statistical spread of y (absorbance), which 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,
then there is no connection. 5 decimal places are displayed.