1. A Framework to Present Bayesian Networks to Domain Experts and Potential Users
Barbaros Yet1, Zane Perkins2, Nigel Tai3, William Marsh2
1Hacettepe University
2Queen Mary University of London
3The Royal London Hospital
01/09/2014

2. Similarities between Clinical and Legal BN Models
Users wants to understand a BN model before using it
Different BN structures for alternative world views:
Legal: Different stories (BN structures) of what happened
Clinical: Different understanding (BN structures) of how diseases work

3. Clinical Models of Alternative World Views

4. Models from Prosecution and Defense

5. Similarities between Clinical and Legal BN Models
Users wants to understand a BN model before using it
Different BN structures of alternative world views:
Legal: Different stories (BN structures) of what happened
Clinical: Different understanding (BN structures) of how diseases work
Limited (relevant) data to learn the NPTs
Critical outcomes

6. Bayesian Networks Graphical structure
Suitable for modelling our causal understanding of the domain
Relations (CIs) are clearer
Is that enough?
01/09/2014

7. Our Vision
Clear BN models that can be browsed, reviewed, criticised and modified by domain experts and users.
01/09/2014

8. Framework to Present Bayesian Networks
Aims:
Organise the data about the knowledge, definitions and assumptions of a BN, and evidence supporting them.
Present the BN in a clear and user-friendly way.
Clinical Evidence Framework
01/09/2014

9. Clinical Evidence vs. Legal Evidence in BNs
Legal Evidence: Observations entered to BN
Clinical Evidence: Knowledge (publications, data and expert knowledge) supporting or conflicting with the BN structure

10. Clinical Evidence Framework
01/09/2014

11. Clinical Evidence Framework – Structure
OWL
BN Model
01/09/2014

12. Structure

13. Fragment (Objects)
Description
Elements

14. Node Description States Where do numbers come from? Evidence
Excluded Parents,
Excluded Children,
Excluded Relation

15. Edge (Relation)
Has supporting evidence
Has conflicting evidence

16. Source Every clinical evidence has a source Data Publication
Domain Experts

17. OWL
A flexible database structure to
Define,
Modify,
Query a database

18. Clinical Evidence Framework - Browser
01/09/2014

20. Acute Traumatic Coagulopathy (ATC)

21. Completeness Queries Review evidence
Variables / edges with/without evidence
SPARQL
SELECT DISTINCT ?x
WHERE{ ?x a :Edge.
?x :hasSupportingEvidence ?evidence.}
MINUS{ ?x :hasSupportingEvidence ?evidence.}}
01/09/2014

22. Thanks!
Yet B, Perkins ZB, Tai NR, and Marsh DWR (2016). “Clinical Evidence Framework for Bayesian Networks” Knowledge and Information Systems DOI: /s
01/09/2014