Generate uniform shell designs for k = 2 to 6
gen.USD(k, alpha = 1)
The number of factors or independent variables, k = 2 to 6.
A scaling factor. See examples.
gen.USD is called to generate the data frame of the design matrix of the USD.
Doehlert, D. H (1970), Uniform Shell Designs, Journal of the Royal Statistical Society, 19(3):231-239
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