Biology Reference
In-Depth Information
rows of the OA represent the experiments or tests to be performed. The
columns of the OA correspond to the different variables whose effects are
being analyzed. The entries in the OA specify the levels at which the vari-
ables are to be applied. A typical OA L 12 (11 2 ) is shown below.
1
1
1
1
1
1
1
1
1
1
1
2
2
2
1
2
2
1
2
1
1
1
1
2
2
2
1
2
2
1
2
1
1
1
1
2
2
2
1
2
2
1
2
1
1
1
1
2
2
2
1
2
2
1
2
2
1
1
1
2
2
2
1
2
2
1
1
2
1
1
1
2
2
2
1
2
2
2
1
2
1
1
1
2
2
2
1
2
2
2
1
2
1
1
1
2
2
2
1
1
2
2
1
2
1
1
1
2
2
2
2
1
2
2
1
2
1
1
1
2
2
2
2
1
2
2
1
2
1
1
1
2
Pick any two columns, say, the first and the last columns, from the
above table.
1
1
2
1
1
1
1
1
1
2
2
1
1
2
2
2
2
1
1
2
2
2
2
2
 
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