INSET Statement

Getting Started

This section introduces the INSET statement with a basic example showing how it is used. See Chapter 45, "INSET and INSET2 Statements," in Part 9, "The SHEWHART Procedure," for a complete description of the INSET statement.

This example is based on the same scenario as the first example in the "Getting Started" section of Chapter 12, "XCHART Statement." A machine fills cans with oil additive and a two-sided cusum chart is used to detect shifts from the target mean of 8.100 ounces. The following statements create the data set OIL and request a two-sided cusum chart with an inset:

   data oil;
      label hour = 'Hour';
      input hour @;
      do i=1 to 4;
         input weight @;
         output;
         end;
      drop i;
      datalines;
    1  8.024  8.135  8.151  8.065
    2  7.971  8.165  8.077  8.157
    3  8.125  8.031  8.198  8.050
    4  8.123  8.107  8.154  8.095
    5  8.068  8.093  8.116  8.128
    6  8.177  8.011  8.102  8.030
    7  8.129  8.060  8.125  8.144
    8  8.072  8.010  8.097  8.153
    9  8.066  8.067  8.055  8.059
   10  8.089  8.064  8.170  8.086
   11  8.058  8.098  8.114  8.156
   12  8.147  8.116  8.116  8.018
   ;

   symbol v=dot c=salmon;
   title 'Cusum Chart for Average Weights of Cans';
   proc cusum data=oil;
      xchart weight*hour /
         mu0     = 8.100           /* Target mean for process  */
         sigma0  = 0.050           /* Known standard deviation */
         delta   = 1               /* Shift to be detected     */
         alpha   = 0.10            /* Type I error probability */
         vaxis   = -5 to 3 
         cinfill = ywh
         climits = salmon
         cframe  = bigb
         cmask   = black
         nolegend;
      label weight = 'Cumulative Sum';
      inset arl0 alpha delta h k mu0 shift sigmas /
         cfill = ligr
         pos = sw;
   run;

The resulting cusum chart is shown in Figure 13.1.

Figure 13.1: Two-Sided Cusum Chart with an Inset

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