Designs specifically tailored to quantitative factors
This GUI covers classical response surface designs (central composite and Box-Behnken) as well as so-called latin-hypercube samples for factors that can and should be set to many different levels. This help file is about when to apply which of these.
Central composite designs
Central composite designs can be generated from scratch or as an extension to
2-level full or fractional factorials generated with the 2-level dialogue
or with function
Their rationale is explained
They usually have five different levels per experimental factor.
Box-Behnken designs have only three levels for each factor. They are explained
here. They can not be generated by augmenting
an existing design.
Latin hypercube designs - if used with optimization which is strongly recommended -
try to fill the experimental space with points in an efficient way. Note that they are
NOT trying to optimize the design w.r.t. a specific statistical model.
Such optimal plans are available outside the R Commander with package
Simple versions of these have already been implemented into the R Commander.
Box G. E. P, Hunter, W. C. and Hunter, J. S. (2005) Statistics for Experimenters, 2nd edition. New York: Wiley.
for the functions behind the central composite designs,
bbd.design for the function behind the Box-Behnken designs,
lhs.design for the function behind the latin hypercube samples.
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