Multidimensional scaling (MDS) methods that aim at pronouncing the clustered appearance of the configuration (Rusch, Mair & Hornik, 2021, <doi:10.1080/10618600.2020.1869027>). They achieve this by transforming proximities/distances with explicit power functions and penalizing the fitting criterion with a clusteredness index, the OPTICS Cordillera (Rusch, Hornik & Mair, 2018, <doi:10.1080/10618600.2017.1349664>). There are two variants: One for finding the configuration directly (COPS-C) with given explicit power transformations and implicit ratio, interval and non-metric optimal scaling transformations (Borg & Groenen, 2005, ISBN:978-0-387-28981-6), and one for using the augmented fitting criterion to find optimal hyperparameters for the explicit transformations (P-COPS). The package contains various functions, wrappers, methods and classes for fitting, plotting and displaying a large number of different MDS models (most of the functionality in smacofx) in the COPS framework. The package further contains a function for pattern search optimization, the “Adaptive Luus-Jaakola Algorithm” (Rusch, Mair & Hornik, 2021,<doi:10.1080/10618600.2020.1869027>) and a functions to calculate the phi-distances for count data or histograms.
Version: 1.12-1 Depends: R (≥ 3.5.0), cordillera (≥ 0.7-2), smacofx Imports: smacof, analogue, cmaes, crs, dfoptim, GenSA, minqa, NlcOptim, nloptr, pso, rgenoud, Rsolnp, subplex Suggests: R.rsp, rmarkdown Published: 2024-09-22 DOI: 10.32614/CRAN.package.cops Author: Thomas Rusch [aut, cre], Patrick Mair [aut], Kurt Hornik [ctb] Maintainer: Thomas Rusch <thomas.rusch at wu.ac.at> License: GPL-2 | GPL-3 URL: https://r-forge.r-project.org/projects/stops/ NeedsCompilation: no Citation: cops citation info Materials: NEWS In views: Psychometrics CRAN checks: cops results Documentation: Downloads: Linking:Please use the canonical form https://CRAN.R-project.org/package=cops to link to this page.
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