On Thu, 2006-06-15 at 07:13 +0300, Jari Oksanen wrote:
1) use nonmetric/gradient descent MDS which seems to
allow missing data, or
Not the isoMDS function in MASS. if N(N-1) is a problem, then nonmetric
MDS may not be the solution.
Sorry for the wrong information: isoMDS does handle
Thanks for the isoMDS pointer. I found one
implementation
of isomap at
http://user.cs.tu-berlin.de/~astro/kmethods
though the web page suggests the code may be immature.
--- Jari Oksanen [EMAIL PROTECTED] wrote:
On Thu, 2006-06-15 at 07:13 +0300, Jari Oksanen
wrote:
1) use
Hello
I will be applying MDS (actually Isomap) to make a
psychological
concept map of the similarities between N concepts.
I would like to scale to a large number of concepts,
however, the
resulting N*(N-1) pairwise similarities is prohibitive
for a user survey.
I'm thinking of giving people
Dear Context Grey,
On 15 Jun 2006, at 6:42, context grey wrote:
I will be applying MDS (actually Isomap) to make a
psychological
concept map of the similarities between N concepts.
So actually, how do you do isomap? RSiteSearch gave me one hit of
isomap. I only ask, because I've
