driftwatch: Sequential Monitoring of Item Parameter Drift
Ongoing surveillance of item parameter drift for continuous testing programs and pre-equated item banks. Estimates item difficulty in rolling calibration windows, runs sequential cumulative sum (CUSUM) detection (Page, 1954, <doi:10.1093/biomet/41.1-2.100>; applied to testing by Veerkamp and Glas, 2000, <doi:10.3102/10769986025004373>) with change-point estimation, separates gradual drift from abrupt jumps, tunes alarm thresholds for a bank-wide false-alarm target by simulation on the program's own design, quantifies score and pass-rate impact, and records recommended actions in an audit log.
| Version: | 0.1.0 |
| Depends: | R (≥ 4.1) |
| Imports: | stats, utils |
| Suggests: | knitr, markdown |
| Published: | 2026-10-07 |
| DOI: | 10.32614/CRAN.package.driftwatch (may not be active yet) |
| Author: | Daniel Edi  [aut,
cre, cph] |
| Maintainer: | Daniel Edi <danieledi2026 at gmail.com> |
| BugReports: | https://github.com/edidatasolutions/driftwatch/issues |
| License: | MIT + file LICENSE |
| URL: | https://github.com/edidatasolutions/driftwatch, https://edidatasolutions.github.io/driftwatch/ |
| NeedsCompilation: | no |
| Materials: | README, NEWS |
| CRAN checks: | driftwatch results |
Documentation:
| Reference manual: | driftwatch.html , driftwatch.pdf |
| Vignettes: |
Continuous drift monitoring for an item bank (source, R code) |
Downloads:
| Package source: | driftwatch_0.1.0.tar.gz |
| Windows binaries: | r-devel: not available, r-release: not available, r-oldrel: driftwatch_0.1.0.zip |
| macOS binaries: | r-release (arm64): driftwatch_0.1.0.tgz, r-oldrel (arm64): driftwatch_0.1.0.tgz, r-release (x86_64): driftwatch_0.1.0.tgz, r-oldrel (x86_64): driftwatch_0.1.0.tgz |
Linking:
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