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:: Home ::Six Sigma ::SIX SIGMA GLOSSARY: Control Charts :: CURRENT STUDENTS LOGIN

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Control Charts
 

Control charts are used to monitor the output of a process. They are used to give timely warning of 'special causes' entering the process. They generally monitor either the process mean, the process variation or a combination of both.

control chart

Control charts have an upper and lower 'Control Limit'. A point plotting outside these limits indicates a 'special cause'. Certain other patterns of points also indicate a 'special cause'.

Pass your mouse over the image to see a point outside a control limit , indicating that the process has changed.

Control charts can be divided into two types; control charts for attributes and control charts for variables. Types of control chart include:

X-Bar & R Control Charts U Charts
X-Bar & S Control Charts CuSum Charts
ImR (Individual Moving Range) Control Charts Tabular Cusum Charts
Median Control Charts CuSum V Mask
Given Value Control Charts Moving Average Control Charts
p Control Charts EWMA Control Charts
np Control Charts  
c Control Charts  
u Control Charts  

Other relevant topics in this glossary include:

 

The selection, design and use of control charts is covered in the MiC Quality courses Statistical Process Control and Advanced Statistical Process Control.

Try out our courses by taking the first module of the Primer in Statistics free of charge.

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