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Knowledge Base » SigmaXL Toolbox

Interpreting a Run Chart with SigmaXL

on December 17, 2015

How do I interpret a Run Chart?

Interpreting Run Charts

SigmaXL allows users to create a Run Chart with Mean or Median displayed as a line on the chart.

On each chart Mean = XX or Median = XX is printed, but in the Nonparametric Runs Test Results visible below the chart, reference is always to the Median.

NPRuns3.jpg

Selecting Show Mean or Show Median when generating the Run Chart does not affect the Nonparametric Runs Test. The Runs Test for lack of randomness, etc., and always references the median rather than the mean.

The reason for this is because the median is robust to the data distribution, whereas the mean is sensitive to departures from normality.

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