1. A fractional factorial design contains a carefully chosen subset of these combinations. 2. Because of this, R . A Fisher popularized the use of factorial designs . 3. When the factors are continuous, two-level factorial designs assume that the effects are linear. 4. Factorial designs are designs that contain two or more independent variables that are completely crossed.5. In this case, fractional factorial designs may be used. 6. The criterion for choosing the subsets is discussed in detail in the fractional factorial designs article. 7. Factorial designs are therefore less attractive if a researcher wishes to consider more than two levels.8. There are a broad variety of factorial designs , so researchers have specific descriptions for the different designs. 9. A full factorial design contains all possible combinations of low / high levels for all the factors. 10. Instead, using what's called a fractional factorial design , Biz Ware selects a subset of eight combinations to test.
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