- R:
- Package:
*stats* - cmdscale(): classical (metric) MDS (an example can be found here)
- Package:
*proxy* - dist(): distance matrix
- Package:
*MASS*(Mondern Applied Statistics in S) - isoMDS(): Kruskal's non-metric MDS (an example can be found here)
- Shepard(): for drawing Shepard diagram
- sammon(): Sammon's non-metric MDS (similar to Kruskal's non-metric MDS but independently developed)
- Package:
*smacof (Scaling by MAjorizing a COplicated Function;*a paper is here) - smacofSym(): for symmetric dissimilarity matrices
- smacofRect(): for rectangular input matrices, i.e., unfolding
- smacofIndDiff(): individual difference MDS
- smacofSphere.primal(): projection of the resulting congurations onto spheres
- smacofSphere.dual(): indirect function to solve linear problems, sometimes faster than primal
- sim2diss(): convert similarity matrix to dissimilarity matrix
- Package:
*labdsv*(Laboratory for Dynamic Synthetic Vegephenonenology) - nmds(): application of isoMDS()
- Package:
*vegan*(R functions for vegetation ecologists) - metaMDS(): an integration of initMDS(), isoMDS(), postMDS(), and wascores()
- procrustes(): for the Procrustes Problem
- wcmdscale(): weighted classical (metric) multidimensional scaling
- Package:
*rggobi* - ggobi(): interactive multidimensional scaling using ggobi and ggvis for display
- Useful Links
- Task View of the Comprehensive R Archive Network
- Notes on the use of R for psychology experiments and questionnaires: here via here
- R site search
- SYSTAT:
- use EM to estimate missing data in nonmetric unfolding model
- power transformation (metric MDS)
- log transformation (metric MDS)
- PERMAP: a highly entertaining, interactive tool to explore perceptual mapping
- SPSS: proxscal, prefscal, alscal
- MATLAB: mdscale()

## Wednesday, January 28, 2009

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