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: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Roberto Furlan > Sent: Friday, January 20, 2006 12:37 PM > To: [email protected] > 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! > > ---------------------------------------- > La mia Cartella di Posta in Arrivo รจ protetta con SPAMfighter > 188 messaggi contenenti spam sono stati bloccati con successo. > Scarica gratuitamente SPAMfighter! > > ______________________________________________ > [email protected] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
