@inproceedings{bielinski-2026-using,
    title = "Using {XGB}oost to Construct a Vertically Skill Difficulty Scale",
    author = "Bielinski, John",
    editor = "Wilson, Joshua  and
      Ormerod, Christopher  and
      Beiting-Parrish, Magdalen",
    booktitle = "Proceedings of the Artificial Intelligence in Measurement and Education Conference ({AIME}-Con): Full Papers",
    month = oct,
    year = "2026",
    address = "Wyndham Grand Pittsburgh Downtown, Pittsburgh, Pennsylvania, United States",
    publisher = "National Council on Measurement in Education (NCME)",
    url = "https://aclanthology.org/2026.aimecon-main.26/",
    pages = "239--244",
    ISBN = "979-8-9983004-0-0"
}