fddm

1.0-2

Fast Implementation of the Diffusion Decision Model

0packages depend

3.3Kdownloads / year

81.6%test coverage

13/13checks pass

Overview

About

Maintained by Henrik SingmannFirst published 2020-07-1011 releasesCRAN page ↗GitHub ↗

Provides the probability density function (PDF), cumulative distribution function (CDF), the first-order and second-order partial derivatives of the PDF, and a fitting function for the diffusion decision model (DDM; e.g., Ratcliff & McKoon, 2008, doi:10.1162/neco.2008.12-06-420) with across-trial variability in the drift rate. Because the PDF, its partial derivatives, and the CDF of the DDM both contain an infinite sum, they need to be approximated. 'fddm' implements all published approximations (Navarro & Fuss, 2009, doi:10.1016/j.jmp.2009.02.003; Gondan, Blurton, & Kesselmeier, 2014, doi:10.1016/j.jmp.2014.05.002; Blurton, Kesselmeier, & Gondan, 2017, doi:10.1016/j.jmp.2016.11.003; Hartmann & Klauer, 2021, doi:10.1016/j.jmp.2021.102550) plus new approximations. All approximations are implemented purely in 'C++' providing faster speed than existing packages.

Install

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

install.packages("fddm", 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("rtdists/fddm")

Development version from rtdists/fddm. 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-fddm

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-fddm

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-fddm

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

Health

CRAN checks

13OK

Slowest check: 8.6 min · r-devel-linux-x86_64-fedora-clang

Code health

Yes

Tests · ratio 0.48

81.6%

Coverage · measured lines

100%

Documentation · exports

Dependencies · direct

Check history

OK2026-04-25
12 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE
NOTE2026-04-22
12 OK · 2 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE
ERROR2026-04-18
11 OK · 2 NOTE · 0 WARNING · 1 ERROR · 0 FAILURE
NOTE2026-03-10
12 OK · 2 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE

Documentation

READMEYes · 876 wordsVignettesYes · dynamicpkgdown siteNoNEWSYes · 100% structuredCode of conductNoContributing guideNo

Examples that run: 100%
Documented parameters: 95%
Return-value docs: 100%
References docs: 82%

Downloads

3.3K

CRAN downloads in the past year

Rank #11,816 · ~9/day · ~279/mo

Releases R versions

Daily download trend is not available in this view yet.

33330 days

87090 days

3.3K1 year

Compare downloads with other packages →

Also on430 r2u33 autocran

Repository

GitHub ↗ rtdists/fddm

18Stars

7Forks

1Open issues

0Open PRs

4Releases

436Commits

2Contributors

436 commits · Last activity 2024-08-01 · 0% stars, 30d

Stars over time

2025-07-05 · 172026-07-07 · 18

Repository practices

Upstream repositoryBeta

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

Checks run against github.com/rtdists/fddm on 2026-07-30.

Continuous integration (2)

GitHub ActionsTravis CI

Docs source (1)

README.Rmd

Lint, format, editor (1)

RStudio project

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

Dependencies

Declared dependencies

19 external dependencies (excludes base and recommended)

Depends (1)

R >= 3.5.0

Imports (4)

RcppstatsmethodsFormula

LinkingTo (2)

Rcpp RcppEigen

Suggests (15)

rtdists RWiener ggplot2 reshape2 testthat knitr rmarkdown microbenchmark ggnewscale ggforce WienR emmeans estimability lmtest numDeriv

Enhances (0)

none

Dependency license breakdown →

Reverse dependencies

0direct

0indirect

Nothing depends on this yet.

Code & Tests

Datasets

People & History

People (3)

Maintainer (1)

Henrik Singmann

Contributor, Maintainer

Authors (1)

Kendal B. Foster

Author

Contributors (2)

Henrik Singmann

Contributor, Maintainer

Achim Zeileis

Contributor · added in 1.0-1

Package Timeline

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

R
R 4.6.0 released · 2026-04-24
R
R 4.5.0 released · 2025-04-11
1.0-2Latest
2024-07-02 · current release · diff ↗
1.0-1
2024-06-26 · diff ↗
R
R 4.4.0 released · 2024-04-24
R
R 4.3.0 released · 2023-04-21
0.5-2
2022-09-09 · diff ↗
R
R 4.2.0 released · 2022-04-22
0.5-1
2022-03-15 · diff ↗
0.4-1
2021-12-13 · diff ↗
0.4-0
2021-08-06 · diff ↗
R
R 4.1.0 released · 2021-05-18
0.3-3
2021-04-06 · diff ↗
0.3-1
2021-03-22 · diff ↗
0.2-2
2020-11-04 · diff ↗
0.2-1
2020-10-14 · diff ↗

Show 2 earlier events

0.1-1
2020-07-10
R
R 4.0.0 released · 2020-04-24

Package metadata

First published: 2020-07-10
Total releases: 11 / 6 yrs
License: GPL (>= 2) OSI
Minimum R: ≥ 3.5.0
Bundled data: 37 KB / 1 file
Download size: 1.3 MB
Installed size: not tracked yet
With dependencies: not tracked yet

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