The Run Chart plots individual observations in run order and is used to identify common cause and special cause variations. It can also perform tests for trends, oscillation, mixtures and clustering (special causes or non-random behaviors).
At the Excel Menu (For Excel 2007, go to Add-ins first)
Choose ProcessMA > Graphs > Run Chart
In Variable, select the column containing the data (Numeric)
Check Plot Mean, if you want to plot mean line
Click OK
You are the quality control engineer in an electronic manufacturing plant. You need to ensure that the switches manufactured are durable. You collected data from the testing laboratory on the number of times the switches are used before breaking down. You want to generate a Run Chart to study the variation.
Open data worksheet by choosing ProcessMA > Tools > Data
Choose ProcessMA > Graphs > Run Chart
In Variable, select E - Switches
Check Plot Mean
Click OK
The P-value for clustering is 0.033. If the desired level of significance is 0.05, it suggests that there are special causes in the process.
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