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BBD for three factors (center point is replicated
three times)
Table 3.6
Factors
Experiment
A
B
C
1
−1
−1
0
2
1
−1
0
3
−1
1
0
4
1
1
0
5
−1
0
−1
6
1
0
−1
7
−1
0
1
8
1
0
1
9
0
−1
−1
10
0
1
−1
11
0
−1
1
12
0
1
1
13
0
0
0
14
0
0
0
15
0
0
0
Table 3.7
BBD for three factors (simplifi ed)
Factors
Experiment
A
B
C
1-4
±1
±1
0
5-8
±1
0
±1
9-12
0
±1
±1
replicates
0
0
0
performed under extreme conditions (for which unsatisfactory results
might occur) are avoided (Ferreira et al., 2007).
A Doehlert (uniform shell) design has equal distances between all
neighboring experiments (Doehlert, 1970). In this design, factors are
varied at different numbers of levels, in the same design. This enables the
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