. The sequence of full factorial design is
(1), a, b, ab, c, ac, bc and abc. Figure 3.3-1 shows the geometric view of .
Suppose that three factors such as A, B and C have two-level.
Then, the full factorial design is a combination of . The sequence of full factorial design is
(1), a, b, ab, c, ac, bc and abc. Figure 3.3-1 shows the geometric view of .
In case of four factors (A, B, C and D), their combinations
can be made by adding the following combinations to: d, ad, bd, abd, cd, acd, bcd and abcd. In
these combinations, the trial (1) represents that the levels of all factors are
the lower levels, which can be denoted as ‘-’ symbol in the DOE table. The
remaining trials denote ‘+’ symbol in the column according to the alphabetic
letter.