This is the program for the 2010 Joint Statistical Meetings in Vancouver, British Columbia.
Abstract Details
Activity Number:
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488
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Type:
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Invited
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Date/Time:
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Wednesday, August 4, 2010 : 10:30 AM to 12:20 PM
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Sponsor:
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Committee on Law and Justice Statistics
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Abstract - #306324 |
Title:
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Formal Statistical Analysis Provides Sounder Inferences Than the U.S. Government's 'Four-Fifths Rule': Examining the Data from Ricci v. DeStefano
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Author(s):
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Weiwen Miao*+ and Joseph L. Gastwirth
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Companies:
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Haverford College and Washington University
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Address:
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, Haverford, PA, 19041,
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Keywords:
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Abstract:
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The data from Ricci v. DeStefano will be discussed from a formal statistical point of view. The City of New Haven was sued because it canceled the exams after seeing that no African-American could be appointed to an existing vacancy. The City justified its action on the basis that the promotion exams had a disparate impact on minorities because the ratios of their pass rates to that of Whites were less than 80%, contrary to a "rule of thumb" in the government's Uniform Guidelines. Unfortunately, neither party used statistical tests. Formal statistical analysis shows that the lieutenant exam had a disparate impact on minorities, but the differences in the pass rates on the captain exam were not close to statistical significance. Our analysis shows that the government's "Four-fifth" rule should not be used when the sample sizes are small.
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