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ProcessControl

  

CControlLimits

  

compute control limits for the C chart

 

Calling Sequence

Parameters

Description

Computation

Options

Examples

References

Calling Sequence

CControlLimits(X, n, options)

Parameters

X

-

data

n

-

sample size

options

-

(optional) equation(s) of the form option=value where option is one of confidencelevel or ubar; specify options for computing the control limits

Description

• 

The CControlLimits command computes the upper and lower control limits for the C chart. Unless explicitly given, the standard deviation of the underlying quality characteristic is computed based on the data.

• 

The first parameter X is a single data sample, given as a Vector or list. Each value represents the number of nonconformities in the corresponding sample.

• 

The second parameter n specifies the size of the individual samples. All samples are expected to be of size n.

Computation

• 

All computations involving data are performed in floating-point; therefore, all data provided must have type realcons and all returned solutions are floating-point, even if the problem is specified with exact values.

• 

For more information about computation in the ProcessControl package, see the ProcessControl help page.

Options

  

The options argument can contain one or more of the following options.

• 

confidencelevel=realcons -- This option specifies the required confidence level. The default value is 0.9973, corresponding to a 3 sigma confidence level.

• 

ubar=deduce or realcons -- This option specifies the average number of nonconformities per inspection unit.

Examples

withProcessControl:

infolevelProcessControl1:

A12,8,6,9,10,12,11,16,10,6,20,15,9,8,6,8,10,7,5,8,5,8,10,6,9

A:=12,8,6,9,10,12,11,16,10,6,20,15,9,8,6,8,10,7,5,8,5,8,10,6,9

(1)

CControlLimitsA,100

0.181764853697590,18.5382351463024

(2)

CControlLimitsA,100,confidencelevel=0.95

3.36366323813659,15.3563367618634

(3)

References

  

Montgomery, Douglas C. Introduction to Statistical Quality Control. 2nd ed. New York: John Wiley & Sons, 1991.

See Also

infolevel

ProcessControl

ProcessControl[CChart]

ProcessControl[PChart]

ProcessControl[PControlLimits]

Statistics

 


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