Statistical Quantification of Individual Differences R package squid version 0.2.1 A simulation-based tool made to help researchers to become familiar with multilevel variations, and to build up sampling designs for their study. This tool has two main objectives: First, it provides an educational tool useful for students, teachers and researchers who want to learn to use mixed-effects models. Users can experience how the mixed-effects model framework can be used to understand distinct biological phenomena by interactively exploring simulated multilevel data. Second, it offers research opportunities to those who are already familiar with mixed-effects models, as it enables the generation of data sets that users may download and use for a range of simulation-based statistical analyses such as power and sensitivity analysis of multilevel and multivariate data [Allegue, H., Araya-Ajoy, Y.G., Dingemanse, N.J., Dochtermann N.A., Garamszegi, L.Z., Nakagawa, S., Reale, D., Schielzeth, H. and Westneat, D.F. (2016) <doi: 10.1111/2041-210X.12659>]. Software Depends: R (>= 4.1.0) Imports: stats, shiny (>= 1.6.0), shinyMatrix (>= 0.4.0), ggplot2 (>= 3.3.5), plotly (>= 4.9.3), grid (>= 4.1.1), MASS (>= 7.3-53.1), lme4 (>= 1.1-21), arm (>= 1.10-1), data.table (>= 1.1-27.1), brms (>= 2.15.0) Suggests: testthat Hassen Allegue <h.all@disroot.org> Comprehensive R Archive Network (CRAN) Hassen Allegue [aut, cre], Yimen G. Araya-Ajoy [aut], Niels J. Dingemanse [aut], Ned A. Dochtermann [aut], Laszlo Z. Garamszegi [aut], Shinichi Nakagawa [aut], Denis Reale [aut], Holger Schielzeth [aut], David F. Westneat [aut] MIT + file LICENSE (https://CRAN.R-project.org/package=squid/LICENSE) 2022-01-21 application/tgz https://CRAN.R-project.org/package=squid doi:10.32614/CRAN.package.squid