[R] Fractional Factorial Design

[paulandpen]

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" <cnaberdl at gmail.com>
To: "R - discussion list" <r-help at stat.math.ethz.ch>
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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