1. tna::engagement
    Example Data on Student Engagement
    csv| xlsx| json| ndjson| rda| rds
    stslist|200 x 20
  2. tna::engagement_mmm
    Example Mixed Markov Model Fitted to the 'engagement' Data
    rda| rds
    mhmm
  3. tna::group_regulation
    Example Data on Group Regulation
    csv| xlsx| json| ndjson| rda| rds
    data.frame|2000 x 26