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Table B-17. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics for Selected NAICS (1) Codes for the United States: 2012

Monday, July 13, 2015

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(Estimates are based on data from the 2012 Commodity Flow Survey)

NAICS code NAICS title Value Tons Ton-miles (2) Average miles per shipment

coefficient of variation of number
Coefficient of variation of number Standard error of percent of total Coefficient of variation of number Standard error of percent of total Coefficient of variation of number Standard error of percent of total
  Total 3.1 0.0 3.7 0.0 6.2 0.0 7.8
324 Petroleum and coal products manufacturing 4.6 1.4 4.7 1.5 14.4 3.4 6.7
325 Chemical manufacturing 5.8 0.5 6.0 0.5 7.8 1.9 4.8
424 Merchant wholesalers, nondurable goods 4.6 1.4 5.5 1.5 10.5 1.7 12.6
4246 Chemical and allied products merchant wholesalers 10.6 0.2 12.7 0.3 10.9 0.3 11.1
4247 Petroleum and petroleum products merchant wholesalers 5.1 1.6 5.9 1.6 10.5 1.2 15.0
4931 Warehousing and storage 31.1 0.7 34.3 0.6 21.3 0.3 21.5

(1) NAICS codes shown are those covered in the Commodity Flow Survey.

(2) Ton-miles estimates are based on estimated distances traveled along a modeled transportation network. See “Mileage Calculations” section for additional information.

NOTES: 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 <>.

NAICS codes shown had the highest estimated weight without considering sampling variability and are shown in descending order.

SOURCE: U.S. Department of Transportation, Bureau of Transportation Statistics and U.S. Department of Commerce, U.S. Census Bureau, 2012 Economic Census: Transportation Commodity Flow Survey, December 2014.