Partitioning and reducing the measuring intervalPartition or reduce the measuring interval to fit different functions.

You may need to reduce the measuring interval if a shows nonlinearity at the ends of the measuring interval. Or, you may need to partition the measuring interval if the differences show constant relationship at small magnitude and proportional relationship at higher values.

Activate the analysis report worksheet.
To reduce the range of the measuring interval, On the Analyse-it ribbon tab, in the Method Comparison group, click Adjust Interval.
The analysis task pane shows the Comparability task.
To partition the measuring interval, On the Analyse-it ribbon tab, in the Method Comparison group, click Partition.
In the Measuring interval(s) grid, under either or both the Lower and Upper column, in the edit boxes, type the lower and upper measuring interval or partition.

Note: If you edit the upper/lower limit of a partition, the lower/upper limit of the next partition is set to the same value respectively.
To only plot points in each interval on the analysis reports, clear the Show data points outside interval check box. If you select this option, the points are shaded gray on plots.
Change the options on the tasks.

Note: Each partition has its own task settings. If you want to use the same settings for a number of partitions, it is best to configure the settings before you partition the measuring interval.
Repeat steps 3 through 6 for each partition.
Click Recalculate.

The analysis creates a separate analysis report for each partition. You can quickly switch between analysis reports for each partition by selecting the partition in the partition grid.

Related concepts

Linearity

Choosing a regression for method comparison

Bland-Altman limits of agreement

How many samples for method comparison?

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