To cite package 'SGPdata' in publications use:

Betebenner DW, Van Iwaarden AR, Domingue B (2021). SGPdata: Exemplar Data Sets for Student Growth Percentiles (SGP) Analyses.. R package version 25.0-0.0, https://centerforassessment.github.io/SGPdata/.

Corresponding BibTeX entry:

  @Manual{,
    title = {{SGPdata}: Exemplar Data Sets for Student Growth
      Percentiles (SGP) Analyses.},
    author = {Damian W. Betebenner and Adam R. {Van Iwaarden} and Ben
      Domingue},
    year = {2021},
    note = {R package version 25.0-0.0},
    url = {https://centerforassessment.github.io/SGPdata/},
  }