[R] data analysis for partial two-by-two factorial design

[Bert Gunter]

This list provides help on R programming (see the posting guide linked
below for details on what is/is not considered on topic), and generally
avoids discussion of purely statistical issues, which is what your query
appears to be. The simple answer is yes, you can fit the model as
described,  but you clearly need the off topic discussion as to what it
does or does not mean. For that, you might try the stats.stackexchange.com
statistical site.

Cheers,
Bert



Bert Gunter

"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )

On Fri, Mar 2, 2018 at 10:34 AM, Ding, Yuan Chun <ycding at coh.org> wrote:

> Dear R users,
>
> I need to analyze data generated from a partial two-by-two factorial
> design: two levels for drug A (yes, no), two levels for drug B (yes, no);
> however, data points are available only for three groups, no drugA/no
> drugB, yes drugA/no drugB, yes drugA/yes drug B, omitting the fourth group
> of no drugA/yes drugB.  I think we can not investigate interaction between
> drug A and drug B, can I still run  model using R as usual:  response
> variable = drug A + drug B?  any suggestion is appreciated.
>
> Thank you very much!
>
> Yuan Chun Ding
>
>
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