Specifications

• Nominal value comparison:
• Result of Wilcoxon test
(additional for nominal value
comparison)
• Extended spiking method:
• Test quantity for a and b
• Threshold quantity t division
• Standard additional method:
• Result F-test
• Result t-test
• Recovery
• Standard deviation for a, b
• Residual standard deviation
• Method standard deviation
• Test quantities ta and tb
• t-distribution
Selectivity
Selectivity means that an analyti-
cal method can distinguish the
substance to be determined from
other substances in the sample.
Selectivity in chromatography
describes the separation capabili-
ty of the chromatographic system
for the components 1 and 2.
Figure 34 shows the planning dia-
log of the checkpoint “selectivity”.
48
Accuracy
Accuracy describes the extent of
correspondence between the
expected value and the conven-
tional value. Accuracy is influ-
enced by the systematic error. The
systematic error is divided into a
constant systematic error and a
proportional systematic error. A
constant systematic error is not
influenced by the concentration of
the substance to be determined. If
the error is influenced by the con-
centration, it is a proportional sys-
tematic error. A qualitative mea-
surement for accuracy is the sys-
tematic deviation of the result.
Figure 33 shows the planning dia-
log of checkpoint “accuracy”.
Planning data
• Determination method:
• Comparison with nominal
value
• Method comparison with
joined sample
• Method comparison with
independent sample
• Standard addition
• Extended spiking method
• Recovery
• Accuracy by recovery
• Other data:
• Number of samples
• Y-units
• Multiple injection possible
Output settings for calculations
• General:
Result t-Test
• Joined samples:
• Difference of value pairs
• Mean value and standard
deviation of differences
Figure 33
Planning dialog for checkpoint "Accuracy"