A few people suggested taking a look at Ripley's book MASS. I know the formula
listed there.
The point is that the manual for the isoMDS function says it's stress output is in
"percent". Does this mean, the stress reported by isoMDS is just the stress
value in MASS (which ranges from 0 to 1) value multiplied by 100? I've haven't been able
to find any resource that expresses stress in values from 0 to 100. So, this would be a
convention introduced by the authors of the package?
In general, I think the R manuals could do with a bit more explaining on the
output of the functions. I understand that some knowledge of statistics is
assumed when working with R but sometimes the documentation on the returned
values is really sparse. Even when familiar with the domain, there are several
different conventions followed by different authors. This should be clear when
reading the manual.
I know a lot of hard work gets into writing software, but it seems sometimes
people are less keen on documenting their hard work properly.
stephen sefick wrote:
You can look in MASS 4 for this formula on page 308 . Go to the
source and ask the horse he'll give you an answer that you endorse.
On Thu, Apr 16, 2009 at 8:13 AM, Bob Green <bgr...@dyson.brisnet.org.au> wrote:
Dieter,
You could always try the "Classification, clustering, and phylogeny
estimation" list which often includes posts regarding MDS:
http://lists.sunysb.edu/index.cgi?A0=CLASS-L
regards
Bob
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