The SHEWHART Procedure

Summary of INSET Keywords

All keywords available with the SHEWHART procedure’s INSET and INSET2 statements request a single statistic in an inset, except for the NTESTS, NTESTS2 and DATA= keywords. The NTESTS and NTESTS2 keywords each require a list of indexes specifying the tests for special causes whose counts of positive results are to be displayed: 

inset ntests 1 2 3 4;
inset ntests2 1 to 4;

For each of the requested tests, the number of positive results for the test is displayed in the inset. So if tests 1 through 4 are requested the results occupy four lines in the inset.

The DATA= keyword specifies a SAS data set containing (label, value) pairs to be displayed in an inset. The data set must contain the variables _LABEL_ and _VALUE_. _LABEL_ is a character variable whose values provide labels for inset entries. _VALUE_ can be character or numeric, and provides values displayed in the inset. The label and value from each observation in the DATA= data set occupy one line in the inset. Figure 18.124 shows an inset containing entries from a DATA= data set.

Table 18.72: Summary Statistics

Keyword

Description

DATA=

(Label, Value) pairs from SAS-data-set

LCL

Primary chart lower control limit

MEAN

Estimated or specified process mean

N

Nominal subgroup size

NMIN

Minimum subgroup size

NMAX

Maximum subgroup size

NOUT

Number of subgroups outside control limits on primary chart

NLOW

Number of subgroups below lower control limit on primary chart

NHIGH

Number of subgroups above upper control limit on primary chart

NTESTS

Number of positive results of tests for special causes on primary chart

STDDEV

Estimated or specified process standard deviation

UCL

Primary chart lower control limit


Table 18.73: Secondary Chart Summary Statistics

Keyword

Description

LCL2

Secondary chart lower control limit

MEAN2

Mean of subgroup ranges or standard deviations

NOUT2

Number of subgroups outside control limits on secondary chart

NLOW2

Number of subgroups below lower control limit on secondary chart

NHIGH2

Number of subgroups above upper control limit on secondary chart

NTESTS2

Number of positive results of tests for special causes on secondary chart

UCL2

Secondary chart upper control limit


Table 18.74: Specification Limits

Keyword

Description

LSL

Lower specification limit

USL

Upper specification limit

TARGET

Target value


Table 18.75: Capability Indices and Confidence Limits

Keyword

Description

CIALPHA

$\alpha $ value for computing capability index confidence limits

CP

Capability index $C_ p$

CPLCL

Lower confidence limit for $C_ p$

CPUCL

Upper confidence limit for $C_ p$

CPK

Capability index $C_{pk}$

CPKLCL

Lower confidence limit for $C_{pk}$

CPKUCL

Upper confidence limit for $C_{pk}$

CPL

Capability index CPL

CPLLCL

Lower confidence limit for CPL

CPLUCL

Upper confidence limit for CPL

CPM

Capability index $C_{pm}$

CPMLCL

Lower confidence limit for $C_{pm}$

CPMUCL

Upper confidence interval for $C_{pm}$

CPU

Capability index CPU

CPULCL

Lower confidence limit for CPU

CPUUCL

Upper confidence limit for CPU


You can use the keywords in Table 18.76 only when producing ODS Graphics output. Greek letters are used in the labels for the statistics requested with the UMU and USIGMA keywords.

Table 18.76: Keywords Specific to ODS Graphics Output

Keyword

Description

TESTLEGEND

Requests a legend of positive tests for special causes

UMU

Estimated or specified process mean

USIGMA

Estimated or specified process standard deviation