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NPCHART Statement |
See SHWNP1 in the SAS/QC Sample Library |
In the previous example, the OUTLIMITS= data set CIRLIM saved control limits computed from the data in CIRCUITS. This example shows how these limits can be applied to new data provided in the following data set:
data circuit2; input batch fail @@; datalines; 31 12 32 9 33 16 34 9 35 3 36 8 37 20 38 4 39 8 40 6 41 12 42 16 43 9 44 2 45 10 46 8 47 14 48 10 49 11 50 9 ;
The following statements create an np chart for the data in CIRCUIT2 using the control limits in CIRLIM:
title 'np Chart for the Proportion of Failing Circuits'; symbol v=dot c=yellow; proc shewhart data=circuit2 limits=cirlim; npchart fail*batch / subgroupn = 500 cframe = vibg cinfill = vlibg coutfill = salmon cconnect = yellow; run;
The LIMITS= option in the PROC SHEWHART statement specifies the data set containing the control limits. By default,* this information is read from the first observation in the LIMITS= data set for which
The resulting np chart is shown in Figure 37.8.
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The number of nonconforming items in the 37 th batch exceeds the upper control limit, signaling that the process is out of control.
In this example, the LIMITS= data set was created in a previous run of the SHEWHART procedure. You can also create a LIMITS= data set with the DATA step; see Example 37.4 for an example. See "LIMITS= Data Set" for details concerning the variables that you must provide.
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