Hi! thanks for your response! >unfortunately, fractional factorial designs typically require all factors to have the same number of levels. Hence, your 2x3x3x5x2 example is not a simple 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 number. >ffDesMatrix from package BHH2 is even worse, since it requires all factors to have 2 levels: k: numeric. The number of 2-levels design factors in the designs.
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, Roberto Furlan University of Turin, Italy ---------------------------------------- La mia Cartella di Posta in Arrivo è protetta con SPAMfighter 188 messaggi contenenti spam sono stati bloccati con successo. Scarica gratuitamente SPAMfighter!
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