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Thepetersenlab package contains a collectionR functions that are widely used by the Petersen Lab (theDevelopmental Psychopathology Lab at the University of Iowa).Included are functions for various purposes, including evaluating the accuracy of judgments and predictions, performing scoring of assessments, generating correlation matrices, conversion of data between various types, data management, psychometric evaluation, extensions related to latent variable modeling, various plotting capabilities, and other miscellaneous useful functions.By making the package available, we hope to make our methods reproducible and replicable by others and to help others perform their data processing and analysis methods more easily and efficiently.The package website is here:https://devpsylab.github.io/petersenlab/.The source code for the package is here:https://github.com/DevPsyLab/petersenlab.

To install the latest stable release fromCRAN, run the following inR:

install.packages("petersenlab")

To install the latest development version fromGitHub, run the following inR:

install.packages("remotes")remotes::install_github("DevPsyLab/petersenlab")

A list of the functions included in the package is here:https://devpsylab.github.io/petersenlab/reference/

To obtain the citation for thepetersenlab package, runcitation("petersenlab"); the citation is:

Petersen, I. T. (2025).petersenlab: A collection of R functions by the Petersen Lab. R package version 1.2.2.https://github.com/DevPsyLab/petersenlab,https://doi.org/10.32614/CRAN.package.petersenlab

ABibTeX entry forLaTeX users is:

@software{petersenlab,  author = {Isaac T. Petersen},  title = {{petersenlab}: A collection of {R} functions by the {Petersen Lab}},  url = {https://github.com/DevPsyLab/petersenlab},  doi = {10.32614/CRAN.package.petersenlab},  version = {1.2.2},  year = {2025}}

This work is licensed underThe MIT License.