R Observatory: Metrics for cosmic version 0.5

Balamuta, James Joseph

doi:10.5281/zenodo.21843040

cosmic

0.5Package record

Conditional Ordinal Stereotype Model for Incident-Level Comparison

0packages depend

1.3Kdownloads / year

54.5%test coverage

13/13flavors OK

Overview

About

Maintained by Greg RidgewayCRAN page ↗

Implements the Conditional Ordinal Stereotype Model for Incident-Level Comparison (COSMIC), a method for analyzing ordinal outcomes observed across multiple actors within shared events. The model uses a conditional likelihood to remove event-level confounding and estimate actor-specific propensities relative to their peers. Efficient computation is achieved via a dynamic programming algorithm for the Poisson-multinomial normalization term, enabling scalable estimation with Markov chain Monte Carlo. The package provides tools for data preparation, model fitting using Stan, and extraction of posterior summaries for comparative inference. Estimation of police officer propensity to escalate force is the primary motivation for the model. For more details see Ridgeway (2026) "A Conditional Ordinal Stereotype Model to Estimate Police Officers’ Propensity to Escalate Force" doi:10.1080/01621459.2025.2597050.

Install

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

install.packages("cosmic", 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-cosmic

Fast Ubuntu binaries via r2u (no compilation). The cranapt setup runs once and is skipped when it is already enabled. We list this channel from recorded r2u download activity rather than from a live index of the repository, so treat it as last known rather than guaranteed.

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-cosmic

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

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

# add the autoCRAN OBS repo (Tumbleweed) if it is missing, then install
zypper -q lr | grep -qi autoCRAN \
  || sudo zypper addrepo https://download.opensuse.org/repositories/devel:/languages:/R:/autoCRAN/openSUSE_Tumbleweed/devel:languages:R:autoCRAN.repo
sudo zypper install -y R-cosmic

RPMs auto-built from CRAN on openSUSE OBS (Tumbleweed). We list this channel from recorded autoCRAN download activity rather than from a live index of the repository, so treat it as last known rather than guaranteed.

Health

CRAN checks

13OK

Additional issues

donttest

CRAN check page ↗

Slowest check: 1.6 min · r-release-macos-x86_64

Status changes

OK13 OK2026-08-05
NOTE12 OK, 1 NOTE2026-08-01
OK6 OK2026-05-05

Advisories

none known

How this is measured·How advisories are found

Documentation

In release 0.5

READMENoVignettesYes · 1 · dynamicNEWSNoCitation fileNoWebsitenot declared in DESCRIPTION

Help pages: 7 (1 internal)includes a package overview page
Examples that run: 0%5 only when donttest examples are enabled (R CMD check --as-cran)
Exported functions with examples: 100%
Documented parameters: 100%
Return-value docs: 100%
Help pages citing references: 14%

Also includes 2 demo scripts (run with demo())

Vignettes (1)

Introduction to cosmic HTML

How these are measured

Downloads

1.3K

CRAN downloads in the past year

Rank #20,338 · ~3/day · ~104/mo

Releases R versions

Daily download trend is not available in this view yet.

27130 days

65090 days

1.3K1 year

Compare downloads with other packages →

Also on39 r2u9 autocran

How downloads are counted

Dependencies

Declared dependencies

13 external dependencies (excludes base and recommended)

Installing cosmic adds 23 packages (13 with compiled code, 6.4 MB of source tarballs). Heaviest: vctrs 1.0 MB, dplyr 902 KB, rlang 766 KB.

Depends (1)

R >= 4.1.0

Imports (3)

dplyr posteriorstats

LinkingTo (0)

none

Suggests (12)

arrangements cmdstanr future future.apply ggplot2 kableExtra knitrMASSprogressr rmarkdown testthat xtable

Enhances (0)

none

Dependency license breakdown →

Reverse dependencies

0direct

0indirect

Nothing depends on this yet.

How these are counted

Code & Tests

Datasets

People & History

People (1)

Greg Ridgeway

Author, Maintainer since 0.5 (2026)

Releases (1)

0.5Latest
record
2026-05-04 · current release
R
R 4.6.0 released · 2026-04-24

Package metadata

First published: 2026-05-04
Total releases: 1 / 1 yrs
License: MIT + file LICENSE OSI
Additional repositories: stan-dev.r-universe.dev
Minimum R: ≥ 4.1.0
Download size: 870 KB

Cite

Cite this package

Run in R for the authors' preferred citation:

citation("cosmic")

Format

Ridgeway, G. (2026). cosmic: Conditional Ordinal Stereotype Model for Incident-Level Comparison (Version 0.5) [Computer software]. https://doi.org/10.32614/CRAN.package.cosmic

This package has no citation file, so citation() returns this entry built from DESCRIPTION.

Cite the R Observatory

For a number measured here: a download total, a coverage figure, an archival date.

Format

APA

Balamuta, J. J. (2026). R Observatory: Metrics for cosmic version 0.5 [Data set]. HJJB, LLC. Data release v2026-10-22. https://doi.org/10.5281/zenodo.21843040

From data release v2026-10-22, which the citation names so these numbers can be found later. More on citing and the projects behind them.

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