From feh3k at spamcop.net  Mon Jan 19 19:03:16 2004
From: feh3k at spamcop.net (Frank E Harrell Jr)
Date: Mon Jan 19 19:02:07 2004
Subject: [Rd] Wish list
In-Reply-To: <Pine.LNX.4.44.0401191706500.4852-100000@gannet.stats>
References: <20040119112942.1997780d.feh3k@spamcop.net>
	<Pine.LNX.4.44.0401191706500.4852-100000@gannet.stats>
Message-ID: <20040119130316.5462409c.feh3k@spamcop.net>

On Mon, 19 Jan 2004 17:17:39 +0000 (GMT)
Prof Brian Ripley <ripley@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


[Rd] Wish list
Frank E Harrell Jr