Volume 33, Issue 2 (March 1988)

    Statistical Evaluation of Truncated Breath-Alcohol Test Measurements

    (Received 7 April 1987; accepted 6 July 1987)

    Published Online: March


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    The reporting of breath-alcohol measurements truncated to two decimal places is a form of computational error. The magnitude of the error can range from 0.000 to 0.009 g/210 L. The truncation error will follow a uniform distribution. A total of 500 breath-alcohol test measurements were evaluated to determine the distribution of the third digit. There are 10 possible discrete values for the third digit. The frequency of each third digit was found to range from 44 for the lowest to 57 for the highest. The data closely approximated the uniform distribution. To conform exactly with the uniform distribution, there would have to be 50 of each decimal value. Given that the third digit approximates the uniform distribution, one cannot attach a greater probability to a particular third-digit value as opposed to another.

    Author Information:

    Gullberg, RG
    Sergeant—breath test section supervisor, Washington State Patrol Crime Laboratory, Seattle, WA

    Stock #: JFS11964J

    ISSN: 0022-1198

    DOI: 10.1520/JFS11964J

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    Title Statistical Evaluation of Truncated Breath-Alcohol Test Measurements
    Symposium , 0000-00-00
    Committee E30