You can use the PUT function in a DATA step to create a character subgroup-variable from a numeric subgroup-variable.
Although this example does not check for the existence of a trend, you should do so by using the hypothesis tests provided by the REG procedure.
If the process were DIAMETER rather than DIAM, the label would be assigned to the variable DIAMTERX.
In Release 6.09 and in earlier releases, it is also necessary to specify the READLIMITS option to read control limits from a LIMITS= data set.
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