@inproceedings{marcheva-nash-etal-2026-ud,
    title = "{UD}-{CHILDES}-{BG}: a dependency treebank of {B}ulgarian child and child-directed speech",
    author = "Marcheva-Nash, Mila  and
      Chantova, Yasena  and
      Kirilova, Tsvetina  and
      Pavlova, Ivelina  and
      Stefanova, Tsvetelina  and
      Vasileva, Yoana  and
      Sun, Weiwei",
    editor = "Liu, Yang Janet  and
      Gessler, Luke",
    booktitle = "Proceedings of the 20th Linguistic Annotation Workshop ({LAW} {XX})",
    month = jul,
    year = "2026",
    address = "San Diego, California, USA",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/ingest-acl-workshops/2026.law-main.9/",
    pages = "113--129",
    ISBN = "979-8-89176-404-0",
    abstract = "This paper presents (i) UD-CHILDES-BG, a manually corrected Universal Dependencies treebank of Bulgarian child and child-directed speech, (ii) a quantitative and phenomenon-based evaluation of inter-annotator agreement on developmental data, and (iii) a systematic analysis of parser errors in this underrepresented domain. We manually correct 4,338 dependency parses (10{\%} of the CHILDES-BG corpus), of which 14{\%} are double-annotated. Inter-annotator agreement on UAS/LAS is 91.71/86.12 for child-directed speech (CDS) and 88.14/81.40 for child speech (CS). Parser performance on the manually corrected portion is 92.70/85.54 for CDS and 90.97/81.52 for CS, compared to a reported 93.37/90.21 on the test set of adult written language. Our analyses reveal that CDS and CS pose challenges for dependency annotation and parsing, particularly in discourse-related structures, which are less common in adult written language."
}