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XSCHART Statement

Syntax

The basic syntax for the XSCHART statement is as follows:

XSCHART process*subgroup-variable ;

The general form of this syntax is as follows:

XSCHART (processes)*subgroup-variable <(block-variables ) >
< =symbol-variable | ='character' > < / options >;


You can use any number of XSCHART statements in the SHEWHART procedure. The components of the XSCHART statement are described as follows.

process
processes
identify one or more processes to be analyzed. The specification of process depends on the input data set specified in the PROC SHEWHART statement.



A process is required. If more than one process is specified, enclose the list in parentheses. For example, the following statements request distinct \bar{X} and s charts for WEIGHT, LENGTH, and WIDTH:

   proc shewhart data=measures;
      xschart (weight length width)*day;
   run;


subgroup-variable
is the variable that identifies subgroups in the data. The subgroup-variable is required. In the preceding XSCHART statement, DAY is the subgroup variable. For details, see "Subgroup Variables" .

block-variables
are optional variables that group the data into blocks of consecutive subgroups. The blocks are labeled in a legend, and each block-variable provides one level of labels in the legend. See "Displaying Stratification in Blocks of Observations" for an example.

symbol-variable
is an optional variable whose levels (unique values) determine the symbol marker or character used to plot the means and standard deviations.



character
specifies a plotting character for charts produced on line printers. For example, the following statements create \bar{X} and s charts using an asterisk (*) to plot the points:

   proc shewhart data=values;
      xschart weight*day='*';
   run;


options
enhance the appearance of the charts, request additional analyses, save results in data sets, and so on. The "Summary of Options" section, which follows, lists all options by function. Chapter 46, "Dictionary of Options," describes each option in detail.


Summary of Options

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