eam

1.2.2

Evidence Accumulation Models

0packages depend

2.6Kdownloads / year

12.8%test coverage

13/13checks pass

Overview

About

Maintained by Guang YangFirst published 2026-01-174 releasesCRAN page ↗GitHub ↗

Simulation-based evidence accumulation models for analyzing responses and reaction times in single- and multi-response tasks. The package includes simulation engines for five representative models: the Diffusion Decision Model (DDM), Leaky Competing Accumulator (LCA), Linear Ballistic Accumulator (LBA), Racing Diffusion Model (RDM), and Levy Flight Model (LFM), and extends these frameworks to multi-response settings. The package supports user-defined functions for item-level parameterization and the incorporation of covariates, enabling flexible customization and the development of new model variants based on existing architectures. Inference is performed using simulation-based methods, including Approximate Bayesian Computation (ABC) and Amortized Bayesian Inference (ABI), which allow parameter estimation without requiring tractable likelihood functions. In addition to core inference tools, the package provides modules for parameter recovery, posterior predictive checks, and model comparison, facilitating the study of a wide range of cognitive processes in tasks involving perceptual decision making, memory retrieval, and value-based decision making. Key methods implemented in the package are described in Ratcliff (1978) doi:10.1037/0033-295X.85.2.59, Usher and McClelland (2001) doi:10.1037/0033-295X.108.3.550, Brown and Heathcote (2008) doi:10.1016/j.cogpsych.2007.12.002, Tillman, Van Zandt and Logan (2020) doi:10.3758/s13423-020-01719-6, Wieschen, Voss and Radev (2020) doi:10.20982/tqmp.16.2.p120, Csilléry, François and Blum (2012) doi:10.1111/j.2041-210X.2011.00179.x, Beaumont (2019) doi:10.1146/annurev-statistics-030718-105212, and Sainsbury-Dale, Zammit-Mangion and Huser (2024) doi:10.1080/00031305.2023.2249522.

Install

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

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

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

if (!requireNamespace("pak", quietly = TRUE))
  install.packages("pak", repos = "https://cloud.r-project.org/")
pak::pak("y-guang/eam")

Development version from y-guang/eam. Installs pak first if it is not already available.

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-eam

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-eam

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-eam

RPMs auto-built from CRAN on openSUSE OBS (Tumbleweed).

Health

CRAN checks

13OK

Slowest check: 3.7 min · r-oldrel-windows-x86_64

Code health

Yes

Tests · ratio 0.34

12.8%

Coverage · measured lines

100%

Documentation · exports

Dependencies · direct

Check history

OK2026-04-22
14 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE
ERROR2026-04-18
13 OK · 0 NOTE · 0 WARNING · 1 ERROR · 0 FAILURE
OK2026-03-10
14 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE

Documentation

READMENoVignettesNopkgdown siteNoNEWSYes · 100% structuredCode of conductNoContributing guideNo

Examples that run: 68%
Documented parameters: 100%
Return-value docs: 100%
References docs: 0%

Downloads

2.6K

CRAN downloads in the past year

Rank #7,187 · ~7/day · ~219/mo

Releases R versions

Daily download trend is not available in this view yet.

38530 days

1.4K90 days

2.6K1 year

Compare downloads with other packages →

Also on238 r2u

Repository

GitHub ↗ y-guang/eam

3Stars

1Forks

0Open issues

0Open PRs

0Releases

383Commits

2Contributors

eamevidence-accumulation-modelddmrdmsimulation

383 commits · Last activity 2026-06-21 · 0% stars, 30d

Stars over time

2026-02-27 · 22026-07-07 · 3

Repository practices

Upstream repositoryBeta

5 development-tooling and community-health practices detected across 3 families in the upstream repository

Checks run against github.com/y-guang/eam on 2026-07-30.

Continuous integration (1)

GitHub Actions

Reproducibility and dev environment (1)

data-raw/

Lint, format, editor (3)

lintrVS CodeRStudio project

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

Dependencies

Declared dependencies

19 external dependencies (excludes base and recommended)

Depends (1)

R >= 4.1.0

Imports (22)

Rcpp dplyr tidyr arrow rlang distributionalstatsparallelcodetoolsgrDevicesgraphicsggplot2 gridExtra data.table purrr scales vctrs tibble JuliaConnectoR NeuralEstimators pbapply abc

LinkingTo (1)

Rcpp

Suggests (1)

testthat

Enhances (0)

none

Dependency license breakdown →

Reverse dependencies

0direct

0indirect

Nothing depends on this yet.

Code & Tests

People & History

People (2)

Maintainer (1)

Guang Yang

Author, Maintainer

Authors (2)

Guang Yang

Author, Maintainer

Guangyu Zhu

Author

Package Timeline

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

1.2.2Latest
2026-05-13 · current release · diff ↗
R
R 4.6.0 released · 2026-04-24
1.2.0
2026-03-29 · diff ↗
1.1.0
2026-02-09 · diff ↗
1.0.1
2026-01-17
R
R 4.5.0 released · 2025-04-11

Package metadata

First published: 2026-01-17
Total releases: 4 / 1 yrs
License: MIT + file LICENSE OSI
Minimum R: ≥ 4.1.0
Download size: 825 KB
Installed size: not tracked yet
With dependencies: not tracked yet

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