[Rd] Wish list
Frank E Harrell Jr
feh3k at spamcop.net
Mon Jan 19 19:26:54 MET 2004
On Mon, 19 Jan 2004 18:13:42 +0000 (GMT)
Prof Brian Ripley <ripley at stats.ox.ac.uk> wrote:
> On Mon, 19 Jan 2004, Frank E Harrell Jr wrote:
> > On Mon, 19 Jan 2004 17:17:39 +0000 (GMT)
> > Prof Brian Ripley <ripley at stats.ox.ac.uk> wrote:
> > > Are you sure there is a measurable difference in calling methods
> > > directly? The dispatch overhead on formula (one of your uses)
> > > appears to be about 10 microseconds. (Note, negligible even for
> > > 10,000 bootstraps.)
> > >
> > > I believe we took the real performance penalties into account (and
> > > namespaces had performance pluses as well as minuses).
> > Brian,
> > I don't worry about dispatch overhead. I do worry about overhead of
> > assembling model matrices, removing rows with NAs, etc. -Frank
> Here is what you said:
> > The point of calling methods directly is efficiency, otherwise I would
> > not use this dirty practice. When bootstrapping or otherwise calling
> > methods
> and your code is failing in R-devel because you are calling
> formula.default. So, *why* are you calling formula.default?
That was fixed 16Dec03 for the next version to be submitted to CRAN. I no
longer call formula.default.
> Calling e.g. glm.fit not glm is not to do with methods, and apparently
> survfit.km is not a method.
You're right, it just has to do with survfit.km needing to be exported.
Frank E Harrell Jr Professor and Chair School of Medicine
Department of Biostatistics Vanderbilt University
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