normref: Continuous Norming

A toolbox for continuous norming of psychological and educational tests, supporting regression-based norming where norms can vary as a continuous function of age or another norm predictor. Norms are estimated using Generalized Additive Models for Location, Scale, and Shape (GAMLSS), enabling flexible modelling of the full score distribution in a normative sample. The package supports applications in psychometrics and psychological testing, and includes functions for model selection, reliability estimation, norm calculation, including confidence intervals, and sample size planning. For more details, see Timmerman et al. (2021) <doi:10.1037/met0000348>.

Version:	0.1.1
Depends:	R (≥ 3.5.0)
Imports:	gamlss, gamlss.dist, ggplot2, lpSolve, openxlsx2, rlang, Rdpack, stats, utils, withr
Suggests:	knitr, rmarkdown, testthat (≥ 3.0.0), gamlss.tr, future, future.apply
Published:	2026-04-10
DOI:	10.32614/CRAN.package.normref
Author:	Klazien de Vries [aut], Hannah Heister [aut], Julian Urban [aut], Lieke Voncken [ctb], Marieke Timmerman [aut, cre]
Maintainer:	Marieke Timmerman <m.e.timmerman at rug.nl>
License:	GPL (≥ 3)
NeedsCompilation:	no
Materials:	README, NEWS
In views:	Psychometrics
CRAN checks:	normref results

Documentation:

Reference manual:	normref.html , normref.pdf
Vignettes:	How to use normref (source, R code)

Downloads:

Package source:	normref_0.1.1.tar.gz
Windows binaries:	r-release: normref_0.1.1.zip, r-oldrel: normref_0.1.1.zip
macOS binaries:	r-release (arm64): normref_0.1.1.tgz, r-oldrel (arm64): normref_0.1.1.tgz, r-release (x86_64): normref_0.0.0.1.tgz, r-oldrel (x86_64): normref_0.1.1.tgz
Old sources:	normref archive

Linking:

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