I did not see the original posting, but I guess it asks about
S-Stress. This is the loss function used in ALSCAL and other
programs that minimize squared deviations between dissimilarities
and squared distances. Details are in any MDS book, for instance
Cox & Cox, Multidimensional Scaling, Chapman and Hall, 1994
Borg and Groenen, Modern Multidimensional Scaling, Springer, 1997
The Takane, Young, De Leeuw reference in Psychometrika, 1977, is
indeed the canonical one.
Another key reference comparing loss functions, algorithms, and so
on is
De Leeuw & Heiser, Theory of Mutlidimensional Scaling, in Handbook
of Statistics, Volume II, North-Holland, 1982
===
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