The PROC PLAN statement starts the PLAN procedure and, optionally, specifies a random number seed or a default method for selecting levels of factors. By default, the procedure uses a random number seed generated from reading the time of day from the computer’s clock and randomly selects levels of factors. These defaults can be modified with the SEED= and ORDERED options, respectively. Unlike many SAS/STAT procedures, the PLAN procedure does not have a DATA= option in the PROC statement; in this procedure, both the input and output data sets are specified in the OUTPUT statement.
You can specify the following options in the PROC PLAN statement:
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SEED=number
specifies an integer used to start the pseudo-random number generator for selecting factor levels randomly. If you do not specify a seed, or if you specify a value less than or equal to zero, the seed is by default generated from reading the time of day from the computer’s clock.
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ORDERED
selects the levels of the factor as the integers 
in order. For more detail, see Selection-Types and Specifying Factor Structures.
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