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XRCHART Statement |
Variable | Description |
_ALPHA_ | probability () of exceeding limits |
_CP_ | capability index C_{p} |
_CPK_ | capability index C_{pk} |
_CPL_ | capability index CPL |
_CPM_ | capability index C_{pm} |
_CPU_ | capability index CPU |
_INDEX_ | optional identifier for the control limits specified with the OUTINDEX= option |
_LCLR_ | lower control limit for subgroup range |
_LCLX_ | lower control limit for subgroup mean |
_LIMITN_ | nominal sample size associated with the control limits |
_LSL_ | lower specification limit |
_MEAN_ | process mean ( or ) |
_R_ | value of central line on R chart |
_SIGMAS_ | multiple (k) of standard error of or R_{i} |
_STDDEV_ | process standard deviation ( or ) |
_SUBGRP_ | subgroup-variable specified in the XRCHART statement |
_TARGET_ | target value |
_TYPE_ | type (estimate or standard value) of _MEAN_ and _STDDEV_ |
_UCLR_ | upper control limit for subgroup range |
_UCLX_ | upper control limit for subgroup mean |
_USL_ | upper specification limit |
_VAR_ | process specified in the XRCHART statement |
Notes:
The OUTLIMITS= data set contains one observation for each process specified in the XRCHART statement. For an example, see "Saving Control Limits" .
Given a process name that contains eight characters, the procedure first shortens the name to its first four characters and its last three characters, and then it adds the suffix. For example, the procedure shortens the process DIAMETER to DIAMTER before adding the suffix.
Variables containing subgroup means, ranges, and sample sizes are created for each process specified in the XRCHART statement. For example, consider the following statements:
proc shewhart data=steel; xrchart (width diameter)*lot / outhistory=summary; run;
The data set SUMMARY contains variables named LOT, WIDTHX, WIDTHR, WIDTHN, DIAMTERX, DIAMTERR, and DIAMTERN.
Additionally, the following variables, if specified, are included:
For an example of an OUTHISTORY= data set, see "Saving Summary Statistics" .
Variable | Description |
_ALPHA_ | probability () of exceeding control limits |
_EXLIM_ | control limit exceeded on chart |
_EXLIMR_ | control limit exceeded on R chart |
_LCLR_ | lower control limit for range |
_LCLX_ | lower control limit for mean |
_LIMITN_ | nominal sample size associated with the control limits |
_MEAN_ | process mean |
_R_ | average range |
_SIGMAS_ | multiple (k) of the standard error associated with control limits |
subgroup | values of the subgroup variable |
_SUBN_ | subgroup sample size |
_SUBR_ | subgroup range |
_SUBX_ | subgroup mean |
_TESTS_ | tests for special causes signaled on chart |
_TESTS2_ | tests for special causes signaled on R chart |
_UCLR_ | upper control limit for range |
_UCLX_ | upper control limit for mean |
_VAR_ | process specified in the XRCHART statement |
In addition, the following variables, if specified,
are included:
Notes:
For an example, see "Saving Control Limits" .
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