3 papers
stat.CO2025
Yet Another Smacof -- Square Symmetric Case
Jan de Leeuw
We rewrite the metric/nonmetric and weighted/unweighted versions of the smacof program for square symmetric data as one monolithic C program. R is used for taking care of the data…
stat.CO2025
Metric/Nonmetric Elastic MDS
Jan de Leeuw
We present R and C implementations for metric (ratio) and non-metric (ordinal) versions of Elastic MDS, the multidimensional scaling technique proposed by McGee (1966). The R and C…
stat.CO2025
Differentiating Generalized Eigenvalues and Eigenvectors
Jan de Leeuw
We give formulae for first and second derivatives of generalized eigenvalues/eigenvectors of symmetric matrices and generalized singular values/singular vectors of rectangular matr…