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cNORM: Continuous Norming

A comprehensive toolkit for generating continuous test norms in psychometrics and biometrics, and analyzing model fit. The package offers both distribution-free modeling using Taylor polynomials and parametric modeling using the beta-binomial distribution. Originally developed for achievement tests, it is applicable to a wide range of mental, physical, or other test scores dependent on continuous or discrete explanatory variables. The package provides several advantages: It minimizes deviations from representativeness in subsamples, interpolates between discrete levels of explanatory variables, and significantly reduces the required sample size compared to conventional norming per age group. cNORM enables graphical and analytical evaluation of model fit, accommodates a wide range of scales including those with negative and descending values, and even supports conventional norming. It generates norm tables including confidence intervals. It also includes methods for addressing representativeness issues through Iterative Proportional Fitting.

Version: 3.4.0
Depends: R (≥ 4.0.0)
Imports: leaps (≥ 3.1), ggplot2 (≥ 3.5.1)
Suggests: knitr, shiny, foreign, readxl, rmarkdown, testthat
Published: 2024-11-04
DOI: 10.32614/CRAN.package.cNORM
Author: Alexandra Lenhard ORCID iD [aut], Wolfgang Lenhard ORCID iD [cre, aut], Sebastian Gary [aut], WPS publisher [fnd] (<https://www.wpspublish.com/>)
Maintainer: Wolfgang Lenhard <wolfgang.lenhard at uni-wuerzburg.de>
BugReports: https://github.com/WLenhard/cNORM/issues
License: AGPL-3
URL: https://www.psychometrica.de/cNorm_en.html, https://github.com/WLenhard/cNORM
NeedsCompilation: no
Citation: cNORM citation info
Materials: README NEWS
In views: Psychometrics
CRAN checks: cNORM results

Documentation:

Reference manual: cNORM.pdf
Vignettes: Modelling Psychometric Data with Beta-Binomial Distributions (source, R code)
Weighted Regression-Based Norming (source, R code)
Demonstration for Creating Continuous Norms with cNORM (source, R code)

Downloads:

Package source: cNORM_3.4.0.tar.gz
Windows binaries: r-devel: cNORM_3.4.0.zip, r-release: cNORM_3.4.0.zip, r-oldrel: cNORM_3.4.0.zip
macOS binaries: r-release (arm64): cNORM_3.4.0.tgz, r-oldrel (arm64): cNORM_3.4.0.tgz, r-release (x86_64): cNORM_3.4.0.tgz, r-oldrel (x86_64): cNORM_3.4.0.tgz
Old sources: cNORM archive

Linking:

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These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.