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Table B-4c. Estimated Standard Errors for Shipment Characteristics by Shipment Weight for the United States: Percentage of Total for 2012 and 2007

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(Estimates are based on data from the 2012 and 2007 Commodity Flow Surveys)

Shipment weight Value

standard error
Tons

standard error
Ton-miles (1)

standard error
2012 2007 2012 2007 2012 2007
Total 0.0 0.0 0.0 0.0 0.0 0.0
Less than 50 lbs. 0.2 0.3 Z 0.0 Z 0.0
50 to 99 lbs. 0.1 0.1 Z 0.0 Z 0.0
100 to 499 lbs. 0.2 0.2 Z 0.0 Z 0.0
500 to 749 lbs. 0.1 0.0 Z 0.0 Z 0.0
750 to 999 lbs. 0.1 0.1 Z 0.0 Z 0.0
1,000 to 9,999 lbs. 0.3 0.4 0.2 0.1 0.2 0.2
10,000 to 49,999 lbs. 0.3 0.5 0.6 0.4 1.1 0.9
50,000 to 99,999 lbs. 0.3 0.2 0.5 0.5 0.2 0.2
100,000 lbs. or more 0.4 0.4 1.0 0.6 1.4 1.3

KEY: Z = Rounds to zero.

(1) 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 <www.census.gov/cfs>.

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.

Updated: Friday, May 19, 2017