[R] R: fractional factorial design in R
statistical.model at googlemail.com
Mon Jan 23 20:02:59 CET 2006
thanks for your response!
>unfortunately, fractional factorial designs typically require all factors
have the same number of levels. Hence, your 2x3x3x5x2 example is not a
special case of a fractional factorial design.
>There are some special plans for mixed level designs, but the conf.design
function requires all factors to have the same number of levels, as you can
also find in its help:
p: The common number of levels for each factor. Must be a prime
>ffDesMatrix from package BHH2 is even worse, since it requires all factors
have 2 levels:
k: numeric. The number of 2-levels design factors in the
I've tried both ffDesMatrix and conf.design and i realized that they cannot
help me for the problem above.
At the moment, I am using an SPSS function (orthoplan) for my needs. It
provides factorial design with only main effects (small orthogonal designs).
Since SPSS is very expensive (in particular with this add-on), I would like
to use R as for all my other projects and research activity.
Do you know any other way to produce these designs in R?
Thanks in advance,
University of Turin, Italy
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