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- Thomas Verma, Judea Pearl
- UAI
- 1990

- Judea Pearl, Thomas Verma
- KR
- 1991

This paper concerns the empirical basis of causation, and addresses the following issues: 1. the clues that might prompt people to perceive causal relationships in uncontrolled observations. 2. the task of inferring causal models from these clues, and 3. whether the models inferred tell us anything useful about the causal mechanisms that underly the… (More)

- Thomas Verma, Judea Pearl
- UAI
- 1988

Dependency knowledge of the fonn "x is independent of y once z is known" invariably obeys a set of four axioms defining semi-graphoids, examples of which are probabilistic and database dependen cies. Such knowledge can often be stored efficiently in graphical structures, using either undirected graphs and directed acyclic graphs (DAGs) . This paper shows… (More)

- Dan Geiger, Thomas Verma, Judea Pearl
- Networks
- 1990

- Dan Geiger, Thomas Verma, Judea Pearl
- UAI
- 1989

An efficient algorithm is developed that identifies all independencies implied by the topology of a Baye sian network. Its correctness and maximality stems from the soundness and completeness of d separation with respect to probability theory. The al gorithm runs in time 0 (IE I ) where E is the number of edges in the network.

- Judea Pearl, Thomas Verma
- AAAI
- 1987

- Judea Pearl, Dan Geiger, Thomas Verma
- Kybernetika
- 1989

Institute of Mathematics of the Academy of Sciences of the Czech Republic provides access to digitized documents strictly for personal use. Each copy of any part of this document must contain these Terms of use. This paper has been digitized, optimized for electronic delivery and stamped with digital signature within the project DML-CZ: The Czech Digital… (More)

- T N Verma, L N Mandal, B K Sinha
- Indian journal of public health
- 1978

- Thomas Verma
- 1999

Data-dependencies of the type “x can tell us more about y given that we already know z ” can be represented in various formalisms: Probabilistic Dependencies, Embedded-Multi-Valued Dependencies, Undirected Graphs and Directed-Acyclic Graphs (DAGs). This paper provides an axiomatic basis, called a semigraph& which captures the structure common to all four… (More)

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