"Cannot revert it"? Doesn't setting up a new default parameter in the calling function ("ave") accomplish that?
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peter dalgaard <pdalgd@gmail.com> wrote:

On May 7, 2011, at 17:21 , Hadley Wickham wrote: >> >> Well, ave() uses interaction(...) and interaction() has a "drop" argument, so >> >>> with(x, ave(H, Site, Prof, drop=TRUE, FUN=function(y)y-min(y))) >> [1] 8 0 51 0 33 22 21 0 > > I don't understand why this isn't the default. > > Hadley Defensive programming, maybe? It's not the default for interaction(), which makes sense, and if you pass a non-default option, you cannot revert it. Not that I can think up a case where you'd actually want to process the empty levels either. -- Peter Dalgaard Center for Statistics, Copenhagen Business School Solbjerg Plads 3, 2000 Frederiksberg, Denmark Phone: (+45)38153501 Email: pd.mes@cbs.dk Priv: PDalgd@gmail.com_____________________________________________
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