Statistical Design of Experiments
Statistical Design of Experiments
Confounding
Confounding
The Big disadvantage of using
The Big disadvantage of using
Fractional Factorials is the
Fractional Factorials is the
risk of confounding factor
risk of confounding factor
effects with interaction effects
effects with interaction effects
Confounding occurs when 2
Confounding occurs when 2
effects, either main or
effects, either main or
interaction, cannot be
interaction, cannot be
separated.
separated.
Usually confounding involves a
Usually confounding involves a
factor and an interaction, but,
factor and an interaction, but,
confounding can also occur
confounding can also occur
between two interaction terms
between two interaction terms
Cannot determine if a factor or
Cannot determine if a factor or
an interaction is really affecting
an interaction is really affecting
the response variable.
the response variable.
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