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