Self-contained marginal maximum likelihood (MML) estimation for unidimensional and multidimensional item response models, including the Rasch / one-parameter logistic, partial credit, rating scale, two-parameter logistic and generalised partial credit models, with latent regression, multiple groups and case weights. A parallelised, dimension-factorised streaming estimation engine supports large between-item (simple-structure) multidimensional models with bounded memory and an opt-in controlled-accuracy quadrature mode that reports a measured approximation error. A usability layer serves non-specialists and automated pipelines: one-stop estimation from common file formats ('Excel', delimited text, 'SPSS', 'Stata', 'SAS') with automatic cleaning and answer-key scoring, pre-estimation data checks, classical item statistics and item fit, plain-language quality ratings, bilingual (English/Chinese) output, spreadsheet exports for item banking and cross-year linking, audience-specific 'Word'/'HTML' reports, and machine-readable results with structured error conditions. Methods follow Adams, Wilson and Wang (1997) <doi:10.1177/0146621697211001>.
| Version: | 1.1.1 |
| Depends: | R (≥ 3.5.0) |
| Imports: | Rcpp, stats, utils, methods, MASS, tools, graphics, grDevices |
| LinkingTo: | Rcpp, RcppArmadillo |
| Suggests: | testthat (≥ 3.0.0), mvtnorm, sfsmisc, readxl, writexl, haven, openxlsx, officer, jsonlite |
| Published: | 2026-07-24 |
| DOI: | 10.32614/CRAN.package.IRTC (may not be active yet) |
| Author: | Kunxiang Ma [aut, cre], WEIAN DATA TECH (Beijing) Co., Ltd. [cph, fnd] |
| Maintainer: | Kunxiang Ma <makunxiang at weiandata.com> |
| BugReports: | https://github.com/weiandata/IRTC/issues |
| License: | GPL-2 | GPL-3 [expanded from: GPL (≥ 2)] |
| Copyright: | See file inst/COPYRIGHTS. IRTC copyright details |
| URL: | https://github.com/weiandata/IRTC |
| NeedsCompilation: | yes |
| Materials: | NEWS |
| CRAN checks: | IRTC results |
| Reference manual: | IRTC.html , IRTC.pdf |
| Package source: | IRTC_1.1.1.tar.gz |
| Windows binaries: | r-devel: not available, r-release: not available, r-oldrel: not available |
| macOS binaries: | r-release (arm64): not available, r-oldrel (arm64): not available, r-release (x86_64): not available, r-oldrel (x86_64): not available |
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