Just a partial answer:
to compare INDSCAL solutions only permutations and scalings of solutions
are authorized. In fact, therefore, in comparing solutions you can right
away see to what extent dimensions are proportional, as can be assessed
by using Tucker coefficient of congruence (phi= a'b / (a'a)^.5(b'b)^.5
,where a and b are two vectors of coordinates form the two different
Indscal solutions).
Arnaud Trollé wrote:
Hi everyone,
I'm a PhD student working in the field of sound quality. I'm using MDS
tools for my data analysis and I'd like to use procrustean analysis to
compare some results coming from 2 different data sets. On this
subject, could anyone tell me which specific procrustes
transformations may be authorized (i.e. make sense) when comparing two
perceptual spaces (with the same dimensionality) given by the MDS
model INDSCAL, and also when comparing two outcomes (configurations of
stimulus points) given by MDPREF ?
Thank you very much in advance,
Arnaud.
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