Median chart: When is it used?

Use the median chart when you want to plot all the measured values, not just subgroup statistics. This may be the case when subgroup ranges vary a great deal, as showing all the points will emphasize the spread. It shows users that individual data points can fall outside the control limits, while the central location is within the limits.

Use the median chart when you can answer yes to these questions:

1. Do you need to assess system stability?

2. Is the data in variables form?

3. Is the data collected in subgroups larger than one?

4. Is the time order of subgroups preserved?

5. Do you want to see individual data points?

See also:
>Median chart: What is it?
>Median chart: What does it look like?
>Median chart: Getting the most