Caio,
using algdesign code below (this produces a full factorial 2*3*3 full
design)
gen.factorial(c(2,3,3))
X1 X2 X3
1 -1 -1 -1
2 1 -1 -1
3 -1 0 -1
4 1 0 -1
5 -1 1 -1
6 1 1 -1
7 -1 -1 0
8 1 -1 0
9 -1 0 0
10 1 0 0
11 -1 1 0
12 1 1 0
13 -1 -1 1
14 1 -1 1
15 -1 0 1
16 1 0 1
17 -1 1 1
18 1 1 1
using .......
optFederov(~.,dat,6)
here is a design that is produced with six trials
X1 X2 X3
3 1 -1 -1
4 -1 1 -1
13 -1 -1 1
15 1 -1 1
16 -1 1 1
18 1 1 1
This does the job with good efficiency.
I would be interested to know what your objection to this is S
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,
[[alternative HTML version deleted]]
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