1. dataPreparation::adult
    Adult for UCI repository
    csv| xlsx| json| ndjson| rda| rds
    data.frame|32561 x 15
  2. dataPreparation::messy_adult
    Adult with some ugly columns added
    csv| xlsx| json| ndjson| rda| rds
    data.table|32561 x 24
  3. dataPreparation::tiny_messy_adult
    First 500 rows of 'messy_adult'
    csv| xlsx| json| ndjson| rda| rds
    data.table|500 x 24