Fitting a Quadrilateral Dissimilarity Model to Same-Different Judgments R package qdm version 0.1-0 This package provides different specifications of a Quadrilateral Dissimilarity Model which can be used to fit same-different judgments in order to get a predicted matrix that satisfies regular minimality [Colonius & Dzhafarov, 2006, Measurement and representations of sensations, Erlbaum]. From such a matrix, Fechnerian distances can be computed. Software Depends: R (>= 3.1.0), stats, graphics Nora Umbach <nora.umbach@web.de> Comprehensive R Archive Network (CRAN) Nora Umbach [aut, cre], Florian Wickelmaier [aut] GPL (>= 2) 2014-10-27 application/tgz https://CRAN.R-project.org/package=qdm doi:10.32614/CRAN.package.qdm