[R] Multiple left hand side variables in a formula

[Frank Harrell]

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.

Thanks
Frank



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Frank Harrell
Department of Biostatistics, Vanderbilt University
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