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" <[EMAIL PROTECTED]> 28/04/2008 14:17:40 >>> alg-design will do the trick regards paul ----- Original Message ----- From: "Caio Azevedo" <[EMAIL PROTECTED]> To: "R - discussion list" <[EMAIL PROTECTED]> Sent: Monday, April 28, 2008 11:11 PM Subject: [R] Fractional Factorial Design > 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]] > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. ******************************************************************* This email and any attachments are confidential. Any use...{{dropped:8}} ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
