Re: [R] Fractional Factorial Design

From: S Ellison <S.Ellison_at_lgc.co.uk>
Date: Mon, 28 Apr 2008 15:00:12 +0100


alg-design doesn;t include fractional factorials; it includes optimal designs.

The BHH2 does include fractional factorials for 2-level designs.

conf.design is perhaps even better; conf.design generates specified confounded fractional factorials for multi-level designs provided that the number of levels is the same for all factors.

I don't know a package that will mix level numbers, but in principle replicating suitably ordered 2-level and a 3-level designs and cbind-ing the two would generate such an experiment.

incidentally, if you;re building your own designs, an essential tool is alias(), which will tell you if you have accidental confounding in terms of interest.

S

>>> "paulandpen" <paulandpen_at_optusnet.com.au> 28/04/2008 14:17:40 >>>
alg-design will do the trick

regards paul

> Hi all,
>
> Does anybody know if it is possible to build a fractional factorial
design
> in R? That is, suppose that we want do design an experiment with 3
factors
> with 2, 3 and 3 levels, respectivly. However we want to consider,
let's
> say,
> only 6 from all possible level combinations. Does R design such
> experiment?
>
> Thanks in advance,
>
> Caio
>
> [[alternative HTML version deleted]]
>
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