Before revision: The algorithm for data-transformation, developed by C. Höschl jr., is thus a dimensionality-reduction technique, such as PCA, and its goodness of fit can be measured by Spearman correlation between the map-distances and data-distances.
After revision: The algorithm for data-transformation, developed by C. Höschl jr., is a dimensionality-reduction technique, such as PCA, and its goodness of fit can be measured by Spearman correlation between the map-distances and data-distances.