To cite package 'SGPdata' in publications use:

Damian W. Betebenner, Adam R. Van Iwaarden and Ben Domingue (2018). SGPdata: Exemplar Data Sets for Student Growth Percentile (SGP) Analyses. (R package version 20.0-0.0. URL 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 = {2018},
    note = {R package version 20.0-0.0},
    url = {https://centerforassessment.github.io/SGPdata/},
  }