stops

1.9-1

Structure Optimized Proximity Scaling

0packages depend

4.6Kdownloads / year

–test coverage

13/13checks pass

Overview

About

Maintained by Thomas RuschFirst published 2023-01-204 releasesCRAN page ↗

Methods that use flexible variants of multidimensional scaling (MDS) which incorporate parametric nonlinear distance transformations and trade-off the goodness-of-fit fit with structure considerations to find optimal hyperparameters, also known as structure optimized proximity scaling (STOPS) (Rusch, Mair & Hornik, 2023,doi:10.1007/s11222-022-10197-w). The package contains various functions, wrappers, methods and classes for fitting, plotting and displaying different 1-way MDS models with ratio, interval, ordinal optimal scaling in a STOPS framework. These cover essentially the functionality of the package smacofx, including Torgerson (classical) scaling with power transformations of dissimilarities, SMACOF MDS with powers of dissimilarities, Sammon mapping with powers of dissimilarities, elastic scaling with powers of dissimilarities, spherical SMACOF with powers of dissimilarities, (ALSCAL) s-stress MDS with powers of dissimilarities, r-stress MDS, MDS with powers of dissimilarities and configuration distances, elastic scaling powers of dissimilarities and configuration distances, Sammon mapping powers of dissimilarities and configuration distances, power stress MDS (POST-MDS), approximate power stress, Box-Cox MDS, local MDS, Isomap, curvilinear component analysis (CLCA), curvilinear distance analysis (CLDA) and sparsified (power) multidimensional scaling and (power) multidimensional distance analysis (experimental models from smacofx influenced by CLCA). All of these models can also be fit by optimizing over hyperparameters based on goodness-of-fit fit only (i.e., no structure considerations). The package further contains functions for optimization, specifically the adaptive Luus-Jaakola algorithm and a wrapper for Bayesian optimization with treed Gaussian process with jumps to linear models, and functions for various c-structuredness indices. Hyperparameter optimization can be done with a number of techniques but we recommend either Bayesian optimization or particle swarm. For using "Kriging", users need to install a version of the archived 'DiceOptim' R package.

Install

R (CRAN)Ubuntu (r2u)Fedora (COPR)

install.packages("stops", repos = "https://cloud.r-project.org/")

Installs the current CRAN release. Prebuilt binaries on Windows and macOS.

Release

# enable cranapt (r2u) if it is not already set up, then install
grep -rqs r2u.stat.illinois.edu /etc/apt/sources.list /etc/apt/sources.list.d/ \
  || curl -fsSL https://raw.githubusercontent.com/eddelbuettel/r2u/master/inst/scripts/add_cranapt_noble.sh | sudo bash
sudo apt install -y r-cran-stops

Fast Ubuntu binaries via r2u (no compilation). The cranapt setup runs once and is skipped when it is already enabled.

bspm (used by r2u) also needs make: sudo apt install make

# enable the iucar/cran COPR if it is not already present, then install
ls /etc/yum.repos.d/*iucar*cran*.repo >/dev/null 2>&1 \
  || sudo dnf copr enable -y iucar/cran
sudo dnf install -y R-CRAN-stops

RPMs from the iucar/cran COPR, rebuilt from CRAN.

For install.packages() integration in R, also: sudo dnf install R-CoprManager

Health

CRAN checks

13OK

Slowest check: 5.8 min · r-devel-linux-x86_64-fedora-clang

Code health

None

Tests · ratio 0.00

not tracked

Coverage

100%

Documentation · exports

Dependencies · direct

Check history

OK2026-06-09
13 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE
ERROR2026-06-08
12 OK · 0 NOTE · 0 WARNING · 1 ERROR · 0 FAILURE
NOTE2026-06-07
12 OK · 1 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE
OK2026-05-02
13 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE
ERROR2026-04-25
11 OK · 0 NOTE · 0 WARNING · 1 ERROR · 0 FAILURE

Show 5 earlier snapshots

OK2026-04-10
14 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE
ERROR2026-04-09
13 OK · 0 NOTE · 0 WARNING · 1 ERROR · 0 FAILURE
OK2026-04-06
14 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE
ERROR2026-04-04
13 OK · 0 NOTE · 0 WARNING · 1 ERROR · 0 FAILURE
OK2026-03-10
14 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE

Documentation

READMENoVignettesYes · dynamicpkgdown siteNoNEWSYes · 100% structuredCode of conductNoContributing guideNo

Examples that run: 96%
Documented parameters: 91%
Return-value docs: 100%
References docs: 0%

Downloads

4.6K

CRAN downloads in the past year

Rank #10,966 · ~13/day · ~383/mo

Releases R versions

Daily download trend is not available in this view yet.

24830 days

97790 days

4.6K1 year

Compare downloads with other packages →

Also on92 r2u41 c2d4u

Repository

Repository ↗ projects/stops

Repository practices

Upstream repositoryBeta

Repository r-forge.r-project.org/projects/stops is linked, but repository-practices checks have not run for it yet. Checks are GitHub-only for now.

How this is detected·Detection ruleset v1 (2026-07-18)

Dependencies

Declared dependencies

19 external dependencies (excludes base and recommended)

Depends (2)

R >= 3.5.0smacofx

Imports (15)

acepack clue cmaes cordillera dfoptim energy minerva nloptr pomp pso registry scagnostics smacof tgp vegan

LinkingTo (0)

none

Suggests (3)

R.rsp DiceOptim DiceKriging

Enhances (0)

none

Dependency license breakdown →

Reverse dependencies

0direct

0indirect

Nothing depends on this yet.

Code & Tests

Code Composition

Rd 3,702 (43%)R 3,615 (42%)Vignettes 1,305 (15%)Other 2 (0%)

Code characteristics

Object systems

S39

Cyclomatic complexity: 5.0 median / 53 max

Test coverage

Line coverage

–

Expression

–

Tests / Examples

–

Functions

63 48 exported

Complexity

4.9 avg / 53 max

Call network

63 nodes / 33 edges

Call graph

Open call graph →

Loading call graph…

Lowest coverage

Per-function coverage is not measured for this package yet.

Datasets

Bundled datasets · 2

Name	Class	Rows × Cols	Also ships in
Pendigits500	data.frame	500 × 17	–
Swissroll	data.frame	150 × 4	–

People & History

People (3)

Maintainer (1)

Thomas Rusch

Author, Maintainer

Authors (2)

Thomas Rusch

Author, Maintainer

Patrick Mair

Author

Contributors (1)

Kurt Hornik

Contributor

Listed in earlier versions (2)

Lisha Chen

no longer listed · 1.0-1

Jan de Leeuw

no longer listed · 1.0-1

Package Timeline

4 releases. Pick two to compare their code metrics. R releases are shown for context.

R
R 4.6.0 released · 2026-04-24
1.9-1Latest
2025-04-28 · current release · diff ↗
R
R 4.5.0 released · 2025-04-11
1.8-2
2024-09-22 · diff ↗
1.6-2
2024-06-28 · diff ↗
R
R 4.4.0 released · 2024-04-24
R
R 4.3.0 released · 2023-04-21
1.0-1
2023-01-20
R
R 4.2.0 released · 2022-04-22

Package metadata

First published: 2023-01-20
Total releases: 4 / 3 yrs
License: GPL-2 | GPL-3 OSI
Minimum R: ≥ 3.5.0
Bundled data: 20 KB / 3 files
Download size: 451 KB
Installed size: not tracked yet
With dependencies: not tracked yet

Appears in task views

Psychometric Models and Methods

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