5. Possible enhancements

5.3 Quality of the mapping

The quality of the mapping has been tested empirically only. Various methods can be used to evaluate numerically how well the mapping adhere to the monotonicity constraint. These methods includes the Kruskal stress function [Kruskal, 1964], the Spearman rank correlation coefficient [Li et al., 1995] and the procrustes analysis [Cox et al., 1994]. To analyse the quality graphically, scatter-plot diagrams can give a visual display of the data correlation.

Cyberspace geography visualization - 15 October 1995

Luc Girardin, The Graduate Institute of International Studies