Data selection and confounding in the court case of Lucia de Berk

Details Data selection and confounding in the court case of Lucia de Berk Data selection and confounding in the court case of Lucia de Berk

2007-08-10

arxiv.org/abs/0708.1401v1

Statistics

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17 pages, PDF from Mathematica notebook

Scientific paper

The nurse Lucia de Berk was convicted by the Dutch courts as a serial killer with 7 murders and 3 attempts at murder in three hospitals where she worked. The nurse however always professed her innocence and indeed was never observed in such an act of murder. The courts based their decision on circumstantial evidence and upon the use of statistics. In the appeal court, the use of statistical calculations was repealed but the use of "data" and "statistical insights" were not excluded. The trial hinged importantly on the role of statistics and data gathering. It appears that data selection and confounding feature strongly in this case. The notion of "nominal correlation" can be used to highlight those two features. This suggests a mistrial with the conviction of an innocent person.

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