Re: [R] fractional factorial design in R

From: Berton Gunter <gunter.berton_at_gene.com>
Date: Sat 21 Jan 2006 - 09:15:49 EST


I'm not sure what you mean by a "fractional factorial" design here. In general, when dealing with complex designs of the sort you appear to be thinking about, small orthogonal designs don't exist. You might wish to look at the AlgDesign package to generate an efficient design to estimate only main effects.

"The business of the statistician is to catalyze the scientific learning process." - George E. P. Box    

> -----Original Message-----
> From: r-help-bounces@stat.math.ethz.ch
> [mailto:r-help-bounces@stat.math.ethz.ch] On Behalf Of Roberto Furlan
> Sent: Friday, January 20, 2006 12:37 PM
> To: r-help@stat.math.ethz.ch
> Subject: [R] fractional factorial design in R
>
> Hi,
> i need to create a fractional factorial design sufficient to
> estimate the
> main effects.
> The factors may have any number of levels, let's say any
> number from 2 to 6.
> I've tried to use the library conf.design , but i cannot
> figure out how to
> write the code.
> For example, what is the code for a design with 5 factors
> (2x3x3x5x2) and
> only main effects not confounded?
>
> thanks in advance!
> Roberto Furlan
> University of Turin, Italy
>
> PS: i've already tried to send this email, sorry if you 've
> received it
> again!
>
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R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Sat Jan 21 09:25:26 2006

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