| Factorial
designs involve testing several
(n) factors at two levels, high and low.
A Fractional Factorial experiment uses only
a half (2n-1), a quarter (2n-2),
or some other division by a power of two
of the number of treatments that would be
required for a Full
Factorial Experiment.
A Full Factorial design with 3 factors
(23 design) would require 8 treatments.
The example shows a 23-1 design,
it requires only 4 treatments:
| Treatment |
A |
B |
C
|
| 1 |
-1 |
-1 |
+1 |
| 2 |
+1 |
-1 |
-1 |
| 3 |
-1 |
+1 |
-1 |
| 4 |
+1 |
+1 |
+1 |
The Fractional Factorial design is created
by aliasing
Factor C with the Interaction AB. This is
a Resolution
III design.
|
