LTCDM

1.1.0

Latent Transition Cognitive Diagnosis Model with Covariates

0packages depend

2.2Kdownloads / year

–test coverage

13/13checks pass

Overview

About

Maintained by Qianru LiangFirst published 2024-05-152 releasesCRAN page ↗

Implementation of the three-step approach of (latent transition) cognitive diagnosis model (CDM) with covariates. This approach can be used for single time-point situations (cross-sectional data) and multiple time-point situations (longitudinal data) to investigate how the covariates are associated with attribute mastery. For multiple time-point situations, the three-step approach of latent transition CDM with covariates allows researchers to assess changes in attribute mastery status and to evaluate the covariate effects on both the initial states and transition probabilities over time using latent logistic regression. Because stepwise approaches often yield biased estimates, correction for classification error probabilities (CEPs) is considered in this approach. The three-step approach for latent transition CDM with covariates involves the following steps: (1) fitting a CDM to the response data without covariates at each time point separately, (2) assigning examinees to latent states at each time point and computing the associated CEPs, and (3) estimating the latent transition CDM with the known CEPs and computing the regression coefficients. The method was proposed in Liang et al. (2023) doi:10.3102/10769986231163320 and demonstrated using mental health data in Liang et al. (in press; annotated R code and data utilized in this example are available in Mendeley data) doi:10.17632/kpjp3gnwbt.1.

Install

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

install.packages("LTCDM", 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-ltcdm

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-LTCDM

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-LTCDM

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

Health

CRAN checks

13OK

Slowest check: 2.7 min · r-devel-linux-x86_64-fedora-clang

Code health

None

Tests · ratio 0.00

not tracked

Coverage

100%

Documentation · exports

None

Vignettes

README

Dependencies · direct

Check history

OK2026-06-09
13 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE
ERROR2026-06-08
12 OK · 0 NOTE · 0 WARNING · 1 ERROR · 0 FAILURE
OK2026-03-10
14 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE

Downloads

2.2K

CRAN downloads in the past year

Rank #22,063 · ~6/day · ~181/mo

Releases R versions

Daily download trend is not available in this view yet.

24830 days

53890 days

2.2K1 year

Compare downloads with other packages →

Also on98 r2u13 autocran

Dependencies

Declared dependencies

4 external dependencies (excludes base and recommended)

Depends (1)

R >= 3.5.0

Imports (4)

GDINA ggplot2 ggpubr ggsignif

LinkingTo (0)

none

Suggests (0)

none

Enhances (0)

none

Dependency license breakdown →

Reverse dependencies

0direct

0indirect

Nothing depends on this yet.

Code & Tests

Code Composition

R 912 (63%)Rd 540 (37%)

Code characteristics

Cyclomatic complexity: 2.0 median / 9 max
Documented parameters: 97%

Test coverage

Line coverage

–

Expression

–

Tests / Examples

–

Functions

11 7 exported

Complexity

3.3 avg / 9 max

Call network

11 nodes / 3 edges

Test coverage has not been measured for this package yet; nodes fall back to a neutral fill.

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Lowest coverage

Per-function coverage is not measured for this package yet.

People & History

People (3)

Maintainer (1)

Qianru Liang

Author, Maintainer, Copyright holder

Authors (2)

Qianru Liang

Author, Maintainer, Copyright holder

Jimmy de la Torre

Author

Contributors (1)

Jingping Du

Contributor

Qianru Liang

Author, Maintainer, Copyright holder

Release timeline

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

R
R 4.6.0 released · 2026-04-24
1.1.0Latest
2025-08-21 · current release · diff ↗
R
R 4.5.0 released · 2025-04-11
1.0.0
2024-05-15
R
R 4.4.0 released · 2024-04-24

Package metadata

First published: 2024-05-15
Total releases: 2 / 2 yrs
License: GPL-3 OSI
Minimum R: ≥ 3.5.0
Bundled data: 95 KB / 1 file
Download size: 109 KB
Installed size: not tracked yet
With dependencies: not tracked yet