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Linearity

Linearity calculates a linear regres-

sion using the least square error for

the model y = a + bx. Linearity can

be carried out by multiple injections

and multiple determinations. Figure

30 shows the planning dialog of

checkpoint “linearity”.

Planning data

• Determination method:

• Regression weighting:

unweighted, weighted 1/x,

weighted 1/x

• Proportionality ( test for

validity of one point

calibrations)

• Other data:

• Number of levels

• Y-units

• Multiple injection possible

• Multiple determination

possible

Output settings for calculations

• Residual standard deviation

• Method standard deviation

Calibration function

The calibration function is the cor-

relation between the expected value

of the test characteristic, e.g. the

extinction (see DIN 55350 part 13),

and the content, e.g. a mass concen-

tration. You can choose the maxi-

mum degree of curve fit for the cali-

bration curve. 1st order is standard

and 3rd order is the maximum

(cubic curve). Figure 31 shows the

planning dialog of checkpoint “cali-

bration function”

Planning data

• Number of levels

• Unit of values

• Curve fit display 1-3

• Multiple injection possible

• Multiple determinations

possible

Figure 30

Planning dialog of checkpoint “Linearity”

Figure 31

Planning dialog of checkpoint “Calibration Function”

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