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Vern R. Walker

Vern R. Walker's Blog


Article Introducing the LLT Lab’s Research in 2010

This article, published in December 2010, provides an overview of the LLT Lab’s methodology and then-current research.

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Some Baseline Results of the Vaccine/Injury Project

Vern Walker submitted a paper and gave a presentation at the Second International Conference on Quantitative Aspects of Justice and Fairness, held on 25-26 February 2011 in Fiesole, near Florence, Italy. The presentation, entitled “Empirically Quantifying Evidence Assessment in Legal Decisions,” reported some baseline results for the Vaccine/Injury Project.

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The Locality Rule in Young

In the case of Young v. United States, the federal District Court was required to apply California substantive law, and the California “Locality Rule” played an important role in deciding the case.

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The MAX Connective

Image of the MAX Connective

MAX is one of the four major logical connectives that we use in modeling the evidence assessment of a factfinder. It is a generalized form of the logical connective OR.

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The MIN Connective

Image of the MIN Connective

MIN is one of the four major logical connectives that we use in modeling the evidence assessment of a factfinder. It is a generalized form of the logical connective AND. But we have to use it very carefully.

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Casey Decision and Prong 1

The Casey decision by Special Master Sweeney illustrates an inference pattern that may incorporate policy considerations unique to Vaccine Act cases.

Image of Casey Model

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“Modus Tollens” Reasoning

In modeling our decisions, we of course look for valid deductive patterns of reasoning, such as “Modus Tollens.”

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Casey Decision and Prong 2

The Casey decision by Special Master Sweeney illustrates reasoning from a “signature effect,” within prong 2 of the Althen test for causation in fact.

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