From bolker at ufl.edu  Mon Feb  8 01:44:52 2010
From: bolker at ufl.edu (Ben Bolker)
Date: Mon, 8 Feb 2010 00:44:52 +0000 (UTC)
Subject: [Rd] Canberra distance
References: <4B6D8D33.2070108@u-paris10.fr> <4B6D945F.2030709@stats.uwo.ca>
	<4B6D9956.3030708@u-paris10.fr>, <4B6DA028.8080902@stats.uwo.ca>
	<1BDAE2969943D540934EE8B4EF68F95FB262394F37@EXNSW-MBX03.nexus.csiro.au>
Message-ID: <loom.20100208T014230-189@post.gmane.org>

 <Bill.Venables <at> csiro.au> writes:

> 
> That is interesting.  The first of these, namely
> 
> sum(|x_i - y_i|) / sum(x_i + y_i)
> 
> is now better known in ecology as the Bray-Curtis distance.  Even more
interesting is the typo in Henry &
> Stevens "A Primer of Ecology in R" where the Bray Curtis distance formula is
actually the Canberra
> distance  (Eq. 10.2 p. 289).  There seems to be a certain slipperiness of
definition in this field.

  Actually, the author is M. H. Henry (Hank) Stevens, not "Henry & Stevens" ...

  Ben Bolker



[Rd] Canberra distance
Ben Bolker