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:: Home ::Six Sigma ::SIX SIGMA GLOSSARY: Fractional Factorial Designs :: CURRENT STUDENTS LOGIN

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Fractional Factorial Designs
 

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.

 

The Design of Experiments is covered in the MiC Quality basic Design of Experiments course and Advanced Design of Experiments course.

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