SPC Procedure

UCHART Statement

  • UCHART < / options>;

The UCHART statement produces control charts for the numbers of nonconformities per inspection unit in subgroup samples. Table 12 lists the options that you can specify in a UCHART statement. For detailed descriptions of these options, see the section Dictionary of Options.

Table 12: UCHART 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 3 sigma 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 u chart


Last updated: September 22, 2026