[R] fractional factorial design in R

Berton Gunter gunter.berton at gene.com
Fri Jan 20 23:15:49 CET 2006

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. 

-- Bert Gunter
Genentech Non-Clinical Statistics
South San Francisco, CA
"The business of the statistician is to catalyze the scientific learning
process."  - George E. P. Box

> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Roberto Furlan
> Sent: Friday, January 20, 2006 12:37 PM
> To: r-help at 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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