Table B-15a. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics for Packing Group I: 2002

Table B-15a. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics for Packing Group I: 2002

[Estimates are shown as percents and are based on data from the 2002 Commodity Flow Survey]

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Description Value Tons Ton-miles
CV Std. error of percent CV Std. error of percent CV Std. error of percent
Total 3.0 4.2 4.4
Packing Group I 5.8 0.9 6.0 1.0 7.0 2.1

KEY:
– Represents an estimate equal to zero or less than 1 unit of measure.
S Estimate does not meet publication standards because of highly sampling variability or poor response quality.
CV Coefficient of variation of number

NOTE: The Introduction and appendixes give information on confidentiality protection, sampling error, nonsampling error, sample design, and definitions. Links to this information on the Internet may be found at www.census.gov/cfs.

SOURCE: Bureau of Transportation Statistics (USDOT) and U.S. Census Bureau, 2002 Commodity Flow Survey, Hazmat Data, December 2004.