The SPC Procedure

The NPCHART statement produces control charts for the numbers of nonconforming items in subgroup samples. Table 8 lists the options that you can specify in an NPCHART statement. For detailed descriptions of these options, see the section Dictionary of Options.

Table 8: NPCHART Statement Options

Option	Description
ALLN	Includes all subgroups in the analysis, regardless of sample size
EXCHART	Produces results only for charts in which exceptions occur
LIMITN=	Specifies the nominal sample size for fixed control limits
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
SIGMAS=	Specifies the width of the control limits in terms of a multiple of the standard error of the subgroup summary statistic
SUBGROUPN=	Specifies a variable in the input data table that contains subgroup sample sizes
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 np chart