| Foldover designs are used
in experimental
design. If the results of a
Resolution
III fractional factorial design
are ambiguous then the experiment can be
converted to a Resolution IV design by 'folding
over ' the original design. This involves
carrying out an additional series of tests
that use the original design matrix but
with the signs of all the factors
reversed (factors that were at the low level
in the original tests are at high level
in the new tests, and vice versa).
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