Reducing the measuring interval

Reduce the measuring interval to find the interval where the fit is linear.

Sometimes it is possible to reduce the measuring interval to a smaller range that is still useful.

On the Analyse-it ribbon tab, in the Statistical Analyses group, click Adjust Interval.
The measuring interval drop-down lists show.
In the Measuring interval drop-down lists, select ≥ 1 and ≤ 5.
Click Recalculate.
The analysis report updates.

The linearity plot differences now lie within the allowable nonlinearity of 0.2 mg/dL. Therefore, the method is declared as linear within 0.2mg/dL between the reduced interval 4.65 and 15.4 mg/dL.