Box-Behnken designs (BBDs) are useful designs for fitting second-order response-surface models. They use only three levels of each factor (compared with 5 for central-composite designs) and sometimes fewer runs are required than a CCD.
This function uses an internal table of BBDs; it only works for 3 to 7 factors.
If k
is specified as a formula, the names in the formula determine the names of the factors in the generated design. Otherwise, the names will be x1, x2, ...
. If coding
is not specified, default codings are created in the form x ~ x.as.is.