{
  "title": "Descriptive Statistics",
  "origin_url": "http://www.xplore-stat.de/ebooks/books/spm/spm.html",
  "license_guess": null,
  "code_sha256": "3b1911c25a1b652907883c06bd21a3b68673d568d7aecc834a92a28cfd12b31e",
  "added_at": "2026-03-13T11:00:00Z"
}