[R-pkgs] smacof package for multidimensional scaling

From: Patrick Mair <patrick.mair_at_wu-wien.ac.at>
Date: Thu, 05 Jun 2008 10:04:40 -0700

Dear UserR's,

The smacof package (see also our PsychoR repository on http://r-forge.r-project.org/projects/psychor/) is uploaded on CRAN.

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 (linear, unique, diagonal, or user-specified constraints; fitting simplex or circumplex)
• 3-way smacof for individual differences (including constraints for idioscal, indscal, and identity)
• Sphere projections (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. Various 2- and 3D-plots are provided and a package vignette is included.

Patrick

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