[R] Multiple left hand side variables in a formula

[Frank Harrell]

Thanks for your reply Gabor.  That doesn't handle a mixture of factor and
numeric variables on the left hand side.
Frank

Gabor Grothendieck wrote
> On Fri, Mar 1, 2013 at 7:16 PM, Frank Harrell <

> f.harrell@

> > wrote:
>> The lattice package uses special logic to allow for multiple
>> left-hand-side
>> variables in a formula, e.g. y1 + y2 ~ x.  Is there an elegant way to do
>> this outside of lattice?  I'm trying to implement a data summarization
>> function that logically takes multiple dependent variables.  The usual
>> invocation of model.frame( ) causes R to try to do arithmetic addition to
>> create a single dependent variable.
>>
> 
> Try:
> 
> lm( cbind(Sepal.Length, Sepal.Width) ~., iris)
> 
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-----
Frank Harrell
Department of Biostatistics, Vanderbilt University
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