1. The multiple-institution database for investigating engineering longitudinal development;Ohland,2016
2. R: A Language and Environment for Statistical Computing,2020
3. T. Rinker, D. Kurkiewicz, K. Hughitt, A. Wang, G. Aden-Buie, A. Wang, & L. Burk (2019). Pacman: package management tool (0.5.1) [computer software]. https://CRAN.R-project.org/package=pacman.
4. I. Patil (2020). Ggstatsplot: “Ggplot2” based plots with statistical details (0.6.1) [computer software]. https://CRAN.R-project.org/package=ggstatsplot.
5. H. Wickham, W. Chang, L. Henry, T.L. Pedersen, K. Takahashi, C. Wilke, K. Woo, H. Yutani, & D. Dunnington (2020). Ggplot2: create elegant data visualisations using the grammar of graphics (3.3.2) [computer software]. https://CRAN.R-project.org/package=ggplot2.