1. RTextTools::NYTimes
    a sample dataset containing labeled headlines from The New York Times.
    csv| xlsx| json| ndjson| rda| rds
    data.frame|3104 x 5
  2. RTextTools::USCongress
    a sample dataset containing labeled bills from the United State Congress.
    csv| xlsx| json| ndjson| rda| rds
    data.frame|4449 x 6