Re: [R] 2^2 factorial design question

From: Ted Harding <>
Date: Fri, 07 Nov 2008 09:51:43 +0000 (GMT)

On 07-Nov-08 00:53:56, Edna Bell wrote:
> Dear R Gurus:
> How do you put together a 2^2 (or even 2^k) factorial problem, please?

I'm not clear about what you mean here, especially about "put together"! Can you describe what you want to end up with in more detail?

> Since you have 2 levels for A and B, do you put in "A+" and "A-" as
> factors, please?

In any case, I would not use the names "A+" and "A-", since this provides too many opportunities for expressions involving these to be interpreted as arithmetic operations. Better, and safer, to use names "A1" and "A0", say.

Best wishes,

> Thanks,
> Edna Bell

E-Mail: (Ted Harding) <> Fax-to-email: +44 (0)870 094 0861
Date: 07-Nov-08                                       Time: 09:51:39
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