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control chart

Control chart 
 We will discuss the historys of a control chart using minitab and you can apply to many 
aspects of the work
  You can use control charts to track process statistics over time and to detect the presence 
of special causes.Minitab plots a process statistic, such as a subgroup mean, individual 
observation,
weighted statistic, or number of defects, versus sample number or time.
 Minitab draws the:
• Center line at the average of the statistic by default
• Upper control limit, 3σ above the center line by default
• Lower control limit, 3σ below the center line by default

Control chart

  Special causes result in variation that can be detected and controlled. Examples include 
differences in supplier, shift, or day of the week. Common cause variation, on the other 
hand, is inherent in the process. A process is in control when only common causes − not
  special causes − affect the process output.
A process is in control when points fall within the bounds of the control limits, and the points

 do not display any nonrandom patterns. Use the tests for special causes offered with 
Minitab's control charts to detect nonrandom patterns in your data. 
  
You can also perform a  Box-Cox transformation on non-normal data.
  When a process is in control, you can use control charts to estimate process parameters 

needed to determine capability.
Minitab offers a variety of options for customizing your control charts:
• See Control Chart Options for options specific to control charts, such as using stages 

and tests for special causes.
• See Control Chart Display Options for options that are available before graph creation, such 

as subsetting your data and changing the control chart's title.
• See Graph Editing Overview for options that are available after graph creation, such 

as changing font size and figure location.

 Exsamples of Control chart 
The following examples illustrate how to generate control charts with Minitab. 
Choose an example below:
1. Box-Cox transformation
2. X-bar and R chart 
3. X-bar and S chart 
4. I-MR-R/S Chart 
5. X-Bar Chart
6. R Chart
7. S chart 
8. zone chart
9. I-MR chart 
10. Z-MR chart 
11. Individuals chart
12. moving range chart 
13. P Chart 
14. NP chart
15. C chart 
16. U chart 



 Referances: www.minitab.com
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