Multidimensional Scaling and Genetic Algorithms : A Solution Approach to Avoid Local Minima
Multidimensional scaling is very common in exploratory data analysis. It is mainly used to represent sets of objects with respect to their proximities in a low dimensional Euclidean space. Widely used optimization algorithms try to improve the representation via shifting its coordinates in direction of the negative gradient of a corresponding fit function. Depending on the initial configuration, the chosen algorithm and its parameter settings there is a possibility for the algorithm to terminate in a local minimum. This article describes the combination of an evolutionary model with a non-metric gradient solution method to avoid this problem. Furthermore a simulation study compares the results of the evolutionary approach with one classic solution method.
|Date of creation:||2002|
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- Richard Johnson, 1973. "Pairwise nonmetric multidimensional scaling," Psychometrika, Springer;The Psychometric Society, vol. 38(1), pages 11-18, March.
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