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MRCHART 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 |
_LCLM_ | lower control limit for subgroup median |
_LCLR_ | lower control limit for subgroup range |
_LIMITN_ | sample size associated with the control limits |
_LSL_ | lower specification limit |
_MEAN_ | estimate of process mean (, ,, or ) |
_R_ | value of central line on range chart |
_SIGMAS_ | multiple (k) of standard error of M_{i} or R_{i} |
_STDDEV_ | process standard deviation ( or ) |
_SUBGRP_ | subgroup-variable specified in the MRCHART statement |
_TARGET_ | target value |
_TYPE_ | type (estimate or standard value) of _MEAN_ and _STDDEV_ |
_UCLM_ | upper control limit for subgroup median |
_UCLR_ | upper control limit for subgroup range |
_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 MRCHART statement. For an example of an OUTLIMITS= data set, 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 medians, ranges, and sample sizes are created for each process specified in the MRCHART statement. For example, consider the following statements:
proc shewhart data=steel; mrchart (width diameter)*lot / outhistory=summary; run;
The data set SUMMARY contains variables named LOT, WIDTHM, WIDTHR, WIDTHN, DIAMTERM, 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 median chart |
_EXLIMR_ | control limit exceeded on range chart |
_LCLM_ | lower control limit for median |
_LCLR_ | lower control limit for range |
_LIMITN_ | nominal sample size associated with the control limits |
_MEAN_ | estimate of process mean (, ,, or ) |
_R_ | average range |
_SIGMAS_ | multiple (k) of the standard error associated with control limits |
subgroup | values of the subgroup variable |
_SUBM_ | subgroup median |
_SUBN_ | subgroup sample size |
_SUBR_ | subgroup range |
_TESTS_ | tests for special causes signaled on median chart |
_TESTS2_ | tests for special causes signaled on range chart |
_UCLM_ | upper control limit for mean |
_UCLR_ | upper control limit for range |
_VAR_ | process specified in the MRCHART statement |
In addition, the following variables, if specified, are included:
Notes:
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