SMACOF for Multidimensional Scaling CRAN Task View: Psychometrics (http://CRAN.R-project.org/view=Psychometrics) This package provides the following approaches of multidimensional scaling (MDS) based on stress minimization by means of majorization (smacof): Simple smacof on symmetric dissimilarity matrices, smacof for rectangular matrices (unfolding models), smacof with constraints on the configuration, three-way smacof for individual differences (including constraints for idioscal, indscal, and identity), and spherical smacof (primal and dual algorithm). Each of these approaches is implemented in a metric and nonmetric manner including primary, secondary, and tertiary approaches for tie handling. Jackknife and permutation tests are included as well. Software Depends: R (>= 2.13.0), polynom, rgl, scatterplot3d, Hmisc, colorspace Imports: graphics, stats Jan de Leeuw <deleeuw@stat.ucla.edu> Jan de Leeuw, Patrick Mair GPL-2 2011-11-29 application/tgz http://CRAN.R-project.org/package=smacof