SPC Procedure

The BOXCHART statement produces control charts for subgroup means or medians, along with statistics that describe the distribution of data within each subgroup. Table 1 lists the options that you can specify in a BOXCHART statement. For detailed descriptions of these options, see the section Dictionary of Options.

Table 1: BOXCHART Statement Options

Option	Description
ALLN	Includes all subgroups in the analysis, regardless of sample size
CIINDICES	Computes capability index confidence limits
CONTROLSTAT=	Specifies whether control limits are computed for subgroup means or subgroup medians
EXCHART	Produces results only for charts in which exceptions occur
LIMITN=	Specifies the nominal sample size for fixed control limits
MEDCENTRAL=	Specifies the method of estimating the process mean when control limits are computed for subgroup medians
NO3SIGMACHECK	Enables tests for special causes to be applied when control limits other than limits are in effect
NOPRINT	Suppresses ODS output
OUTLIMITS=	Creates an output data table that contains control limits
OUTTABLE=	Creates an output data table that contains subgroup summary statistics and control limits
PCTLDEF=	Specifies the percentile definition for box-and-whisker computation
SIGMAS=	Specifies the width of the control limits in terms of a multiple of the standard error of the subgroup summary statistic
SMETHOD=	Specifies the method of estimating the process standard deviation
SPECS=	Specifies an input data table that contains process specification limits and computes process capability indices
TEST2RUN=	Specifies the length of the pattern for Test 2
TEST3RUN=	Specifies the length of the pattern for Test 3
TESTNSTD	Applies tests for special causes to standardized chart statistics
TESTOVERLAP	Performs tests for special causes on overlapping patterns of points
TESTS=	Requests tests for special causes for the box chart