[R] Factorial design in blocks

[Marcos Sanches]

	Hi list,

       I need to perform a factorial study 5*3^2. There are 45 possible
combinations at all, but I can't use all this factor level combination at
once. So I am intending to perform this study using blocks. The ideal size
of blocks would be 9, or at most 12 combinations per block. Which
combination should I put in each block in order to have estimates for the
main effects at least? Can R construct this blocks?

	Thanks,

	Marcos

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