stgam

1.2.0

Spatially and Temporally Varying Coefficient Models Using Generalized Additive Models

0packages depend

2.6Kdownloads / year

–test coverage

12/13checks pass

Overview

About

Maintained by Lex ComberFirst published 2024-06-258 releasesCRAN page ↗GitHub ↗

A framework for undertaking space and time varying coefficient models (varying parameter models) using a Generalized Additive Model (GAM) with smooths approach. The framework suggests the need to investigate for the presence and nature of any space-time dependencies in the data. It proposes a workflow that creates and refines an initial space-time GAM and includes tools to create and evaluate multiple model forms. The workflow sequence is to: i) Prepare the data by lengthening it to have a single location and time variables for each observation. ii) Create all possible space and/or time models in which each predictor is specified in different ways in smooths. iii) Evaluate each model via their AIC value and pick the best one. iv) Create the final model. v) Calculate the varying coefficient estimates to quantify how the relationships between the target and predictor variables vary over space, time or space-time. vi) Create maps, time series plots etc. The number of knots used in each smooth can be specified directly or iteratively increased. This is illustrated with a climate point dataset of the dry rain forest in South America. This builds on work in Comber et al (2024) doi:10.1080/13658816.2023.2270285 and Comber et al (2004) doi:10.3390/ijgi13120459.

Install

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

install.packages("stgam", 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("lexcomber/stgam")

Development version from lexcomber/stgam. 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-stgam

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-stgam

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-stgam

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

Health

CRAN checks

1NOTE12OK

Failing flavors

NOTE r-devel-linux-x86_64-debian-gcc

Slowest check: 8.0 min · r-oldrel-macos-x86_64

Code health

None

Tests · ratio 0.00

not tracked

Coverage

100%

Documentation · exports

Dependencies · direct

Check history

NOTE2026-08-01
12 OK · 1 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE
OK2026-06-08
13 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE
NOTE2026-06-07
12 OK · 1 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE
OK2026-03-10
14 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE

Documentation

READMEYes · 319 wordsVignettesYes · dynamicpkgdown siteNoNEWSYes · 67% structuredCode of conductNoContributing guideNo

Examples that run: 80%
Documented parameters: 100%
Return-value docs: 100%
References docs: 0%

Downloads

2.6K

CRAN downloads in the past year

Rank #17,049 · ~7/day · ~219/mo

Releases R versions

Daily download trend is not available in this view yet.

18130 days

63190 days

2.6K1 year

Compare downloads with other packages →

Also on154 r2u3 autocran

Repository

GitHub ↗ lexcomber/stgam

7Stars

4Forks

1Open issues

2Open PRs

0Releases

160Commits

3Contributors

160 commits · Last activity 2026-05-18

Repository practices

Upstream repositoryBeta

2 development-tooling and community-health practices detected across 2 families in the upstream repository

Checks run against github.com/lexcomber/stgam on 2026-08-02.

Continuous integration (1)

GitHub Actions

Lint, format, editor (1)

RStudio project

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

Dependencies

Declared dependencies

18 external dependencies (excludes base and recommended)

Depends (3)

R >= 4.1.0mgcvglue

Imports (7)

foreach doParallelparalleldplyr magrittr purrr stringr

LinkingTo (0)

none

Suggests (11)

cols4all knitr ggplot2 cowplot rmarkdown testthat (>= 3.0.0)tidyr lubridate sf gratia kableExtra

Enhances (0)

none

Dependency license breakdown →

Reverse dependencies

0direct

0indirect

Nothing depends on this yet.

Code & Tests

People & History

People (4)

Maintainer (1)

Lex Comber

Author, Maintainer

Authors (1)

Lex Comber

Author, Maintainer

Contributors (3)

Chris Brunsdon

Contributor

Paul Harris

Contributor

Gonzalo Irisarri

Contributor · added in 1.2.0

Package Timeline

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

R
R 4.6.0 released · 2026-04-24
1.2.0Latest
2026-01-29 · current release · diff ↗
1.1.0
2025-08-27 · diff ↗
1.0.2
2025-06-12 · diff ↗
1.0.1
2025-06-07 · diff ↗
1.0.0
2025-05-12 · diff ↗
R
R 4.5.0 released · 2025-04-11
0.0.1.2
2024-07-31 · diff ↗
0.0.1.1
2024-07-12 · diff ↗
0.0.1.0
2024-06-25
R
R 4.4.0 released · 2024-04-24

Package metadata

First published: 2024-06-25
Total releases: 8 / 2 yrs
License: MIT + file LICENSE OSI
Minimum R: ≥ 4.1.0
Bundled data: 26 KB / 1 file
Download size: 3.3 MB
Installed size: not tracked yet
With dependencies: not tracked yet

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