RSCAT

1.1.3

Shadow-Test Approach to Computerized Adaptive Testing

0packages depend

2.6Kdownloads / year

1.2%test coverage

13/13checks pass

Overview

About

Maintained by Bingnan JiangFirst published 2019-04-125 releasesCRAN page ↗GitHub ↗

As an advanced approach to computerized adaptive testing (CAT), shadow testing (van der Linden(2005) doi:10.1007/0-387-29054-0) dynamically assembles entire shadow tests as a part of selecting items throughout the testing process. Selecting items from shadow tests guarantees the compliance of all content constraints defined by the blueprint. 'RSCAT' is an R package for the shadow-test approach to CAT. The objective of 'RSCAT' is twofold: 1) Enhancing the effectiveness of shadow-test CAT simulation; 2) Contributing to the academic and scientific community for CAT research. RSCAT is currently designed for dichotomous items based on the three-parameter logistic (3PL) model.

Install

R (CRAN)pak (dev)Ubuntu (r2u)

install.packages("RSCAT", 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("act-org/RSCAT")

Development version from act-org/RSCAT. 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-rscat

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

Health

CRAN checks

13OK

Slowest check: 2.3 min · r-devel-linux-x86_64-fedora-clang

Code health

Yes

Tests · ratio 0.07

1.2%

Coverage · measured lines

100%

Documentation · exports

Dependencies · direct

Check history

OK2026-04-06
14 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE
ERROR2026-04-04
13 OK · 0 NOTE · 0 WARNING · 1 ERROR · 0 FAILURE
OK2026-03-10
14 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE

Documentation

READMEYes · 1,159 wordsVignettesNopkgdown siteNoNEWSNoCode of conductNoContributing guideNo

Examples that run: 100%
Documented parameters: 100%
Return-value docs: 22%
References docs: 0%

Downloads

2.6K

CRAN downloads in the past year

Rank #16,333 · ~7/day · ~220/mo

Releases R versions

Daily download trend is not available in this view yet.

19530 days

70190 days

2.6K1 year

Compare downloads with other packages →

Also on93 r2u

Repository

GitHub ↗ act-org/rscat

Repository practices

Upstream repositoryBeta

Repository github.com/act-org/rscat is linked, but repository-practices checks have not run for it yet.

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

Dependencies

Declared dependencies

8 external dependencies (excludes base and recommended)

Depends (5)

R >= 3.4.0rJava shiny shinycssloaders shinyjs

Imports (7)

Metrics ggplot2 gridExtragridmethodsstatsutils

LinkingTo (0)

none

Suggests (1)

testthat

Enhances (0)

none

Dependency license breakdown →

Reverse dependencies

0direct

0indirect

Nothing depends on this yet.

Code & Tests

Code Composition

R 1,221 (76%)Rd 391 (24%)

Code characteristics

Object systems

S4 class6S4 generic1S4 method2

Cyclomatic complexity: 1.5 median / 25 max
Test cases: 2 / 0.07 per code line

Test coverage

Line coverage

Expression

1.9%

Tests / Examples

1.2% / – ex

Functions

6 3 exported

Complexity

5.5 avg / 25 max

Call network

6 nodes / 2 edges

Call graph

Open call graph →

Loading call graph…

Lowest coverage

6 functions

Function	Cyclo	Coverage
launchApp exp	1	0%
result2CSV exp	2	0%
runSim exp	3	0%
.onLoad	1	0%
pasteWithQuote	1	0%
shinyAppServer	25	0%

People & History

People (2)

Maintainer (1)

Bingnan Jiang

Author, Maintainer

Authors (1)

Bingnan Jiang

Author, Maintainer

ACT, Inc.

Package Timeline

5 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
R
R 4.4.0 released · 2024-04-24
R
R 4.3.0 released · 2023-04-21
R
R 4.2.0 released · 2022-04-22
1.1.3Latest
2021-10-12 · current release · diff ↗
R
R 4.1.0 released · 2021-05-18
1.1.2
2021-05-16 · diff ↗
1.1.1
2021-05-08 · diff ↗
R
R 4.0.0 released · 2020-04-24
1.1.0
2020-01-17 · diff ↗
R
R 3.6.0 released · 2019-04-26
1.0.0
2019-04-12
R
R 3.5.0 released · 2018-04-23

Package metadata

First published: 2019-04-12
Total releases: 5 / 7 yrs
License: CC BY-NC 4.0
Minimum R: ≥ 3.4.0
Download size: 354 KB
Installed size: not tracked yet
With dependencies: not tracked yet

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