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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