R Observatory: Metrics for fddm version 1.0-2

Balamuta, James Joseph

doi:10.5281/zenodo.21843040

fddm

1.0-2Package record

Fast Implementation of the Diffusion Decision Model

0packages depend

3.6Kdownloads / year

81.6%test coverage

13/13flavors OK

Overview

About

Maintained by Henrik SingmannCRAN page ↗GitHub ↗Issues ↗

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.

Changes in 1.0-2

New Features

added function ddm() which permits formula-based fitting of the DDM using the analytic gradient.

Other Changes

the order of the arguments v and a to functions dfddm(), pfddm(), and the PDF derivatives d*_ddm() were changed. Previously, it was ...ddm(..., a, v, ...), and now it is ...ddm(..., v, a, ...)
character variables in med_dec transformed to factors.
updated example vignette by showing how to use the new ddm() function.

From NEWS.md in the release

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. 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-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). 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

CRAN check page ↗

Slowest check: 7.5 min · r-oldrel-windows-x86_64

Status changes

OK13 OK2026-08-05
NOTE12 OK, 1 NOTE2026-08-01
OK12 OK2026-04-25
NOTE12 OK, 2 NOTE2026-04-22
ERROR11 OK, 2 NOTE, 1 ERROR2026-04-18

Show 1 earlier changeHide 1 earlier change

NOTE12 OK, 2 NOTE2026-03-10

Advisories

none known

How this is measured·How advisories are found

Documentation

In release 1.0-2

READMEYes · 876 wordsVignettesYes · 5 · dynamicNEWSYes · 100% structured · mentions 1.0-2Citation fileNoWebsitenot declared in DESCRIPTION

Help pages: 17
Examples that run: 100%16 run in a plain check
Exported functions with examples: 100%
Documented parameters: 95%
Return-value docs: 100%
Help pages citing references: 82%

Vignettes (5)

How these are measured

Downloads

3.6K

CRAN downloads in the past year

Rank #8,537 · ~10/day · ~297/mo

Releases R versions

Daily download trend is not available in this view yet.

46030 days

1.1K90 days

3.6K1 year

Compare downloads with other packages →

Also on383 r2u4 autocran

How downloads are counted

Repository

rtdists/fddm ↗Organization: rtdists

19Stars

8Forks

1Open issues

0Open PRs

4Releases

436Commits

2Commit identities

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

Responsiveness

How these are sampled

PRs merged (all time): 86%
Median days to close, 50 most recently updated closed issues: not measured
Median days to close, 50 most recently updated closed PRs: 0

Stars over time

2025-07-05 · 172026-08-08 · 19

How these are measured

PracticesBeta

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

Checks run against github.com/rtdists/fddm on 2026-10-18.

Continuous integration (3)

GitHub ActionsR CMD check workflowTravis CI (config file)

The R CMD check workflow runs on Linux, macOS and Windows, and on R-devel

Docs source (1)

README.Rmd

Lint, format, editor (1)

RStudio project

How this is detected·Detection ruleset v3 (2026-09-26)

Dependencies

Declared dependencies

19 external dependencies (excludes base and recommended)

Installing fddm adds 3 packages (2 with compiled code, 3.5 MB of source tarballs). Heaviest: Rcpp 1.8 MB, RcppEigen 1.7 MB, Formula 46 KB.

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.

How these are counted

Code & Tests

Datasets

People & History

People (3)

Henrik Singmann

Contributor, Maintainer since 0.1-1 (2020)

Kendal B. Foster

Author

Achim Zeileis

Contributor · added in 1.0-1

methods partially taken from betareg

Releases (11)

Pick two releases to compare their code metrics.

R
R 4.6.0 released · 2026-04-24
R
R 4.5.0 released · 2025-04-11
1.0-2Latest
record
2024-07-02 · current release · diff ↗
1.0-1
record
2024-06-26 · diff ↗ ·
added 13 exports
da2_dfddm, da_dfddm, ddm, dsv2_dfddm, dsv_dfddm, dt02_dfddm, dt0_dfddm, dt2_dfddm, dt_dfddm, dv2_dfddm, dv_dfddm, dw2_dfddm, dw_dfddm
R
R 4.4.0 released · 2024-04-24
R
R 4.3.0 released · 2023-04-21
0.5-2
record
2022-09-09 · diff ↗
R
R 4.2.0 released · 2022-04-22
0.5-1
record
2022-03-15 · diff ↗
0.4-1
record
2021-12-13 · diff ↗
0.4-0
record
2021-08-06 · diff ↗ ·
added 1 export
pfddm
R
R 4.1.0 released · 2021-05-18
0.3-3
record
2021-04-06 · diff ↗
0.3-1
record
2021-03-22 · diff ↗
0.2-2
record
2020-11-04 · diff ↗
0.2-1
record
2020-10-14 · diff ↗

Show 2 earlier eventsHide 2 earlier events

0.1-1
record
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

Cite

Cite this package

Run in R for the authors' preferred citation:

citation("fddm")

Format

Singmann, H., Foster, K. B., & Zeileis, A. (2024). fddm: Fast Implementation of the Diffusion Decision Model (Version 1.0-2) [Computer software]. https://doi.org/10.32614/CRAN.package.fddm

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 fddm version 1.0-2 [Data set]. HJJB, LLC. Data release v2026-10-21. https://doi.org/10.5281/zenodo.21843040

From data release v2026-10-21, which the citation names so these numbers can be found later. More on citing and the projects behind them.

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