26 citations · 28 across the 6 of their papers we have counts for
4 papers · 1 filter
Higher Partials of fStress
Jan de Leeuw
We define *fDistances*, which generalize Euclidean distances, squared distances, and log distances. The least squares loss function to fit fDistances to dissimilarity data is *fStr…
Global Minima by Penalized Full-dimensional Scaling
Jan de Leeuw
The full-dimensional (metric, Euclidean, least squares) multidimensional scaling stress loss function is combined with a quadratic external penalty function term. The trajectory of…
Convergence of SMACOF
Jan De Leeuw
To study convergence of SMACOF we introduce a modification mSMACOF that rotates the configurations from each of the SMACOF iterations to principal components. This modification, ca…
Improved approximation and visualization of the correlation matrix
Jan Graffelman, Jan de Leeuw
The graphical representation of the correlation matrix by means of different multivariate statistical methods is reviewed, a comparison of the different procedures is presented wit…