Biometrika Apr 13, 2026

Revisiting Madigan and Mosurski: Collapsibility via Minimal Separators

Authors
Yi Sun Jianhua Guo Pei Heng Shiyuan He
Paper Information
  • Journal:
    Biometrika
  • DOI:
    10.1093/biomet/asag024
  • Published:
    April 13, 2026
  • Added to Tracker:
    Apr 15, 2026
Abstract

Abstract Collapsibility provides a principled approach to dimension reduction in contingency tables and graphical models. Madigan & Mosurski (1990) pioneered the study of minimal collapsible sets in decomposable models, but existing algorithms for general graphs remain computationally demanding. We show that a model is collapsible on to a target set precisely when that set contains at least one minimal separator between its nonadjacent vertices. This insight motivates the close minimal separator absorption algorithm, which constructs minimal collapsible sets using only local separator searches at very low costs. Simulations confirm substantial efficiency gains, making collapsibility analysis practical in high-dimensional settings.

Author Details
Yi Sun
Author
Jianhua Guo
Author
Pei Heng
Author
Shiyuan He
Author
Citation Information
APA Format
Yi Sun , Jianhua Guo , Pei Heng & Shiyuan He (2026) . Revisiting Madigan and Mosurski: Collapsibility via Minimal Separators. Biometrika , 10.1093/biomet/asag024.
BibTeX Format
@article{paper1111,
  title = { Revisiting Madigan and Mosurski: Collapsibility via Minimal Separators },
  author = { Yi Sun and Jianhua Guo and Pei Heng and Shiyuan He },
  journal = { Biometrika },
  year = { 2026 },
  doi = { 10.1093/biomet/asag024 },
  url = { https://doi.org/10.1093/biomet/asag024 }
}