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The PLAN Procedure 
This plan is appropriate for a splitplot design with main plots forming a randomized complete block design. In this example, there are three blocks, four main plots per block, and two subplots per main plot. First, three random permutations (one for each of the blocks) of the integers 1, 2, 3, and 4 are produced. The four integers correspond to the four levels of the main plot factor a; the permutation determines how the levels of a are assigned to the main plots within a block. For each of these twelve numbers (four numbers per block for three blocks), a random permutation of the integers 1 and 2 is produced. Each twointeger permutation determines the assignment of the two levels of the subplot factor b within a main plot. The following statements produce Output 50.1.1:
title 'Split Plot Design'; proc plan seed=37277; factors block=3 ordered a=4 b=2; run;Output 50.1.1: A SplitPlot Design

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