HP LC2000r - NetServer - 128 MB RAM Dokumentacja Pobierz pdf (Strona 48)

• 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"

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