Table B-4c. Estimated Standard Errors for Shipment Characteristics by Shipment Weight for the United States: Percentage of Total for 2012 and 2007
(Estimates are based on data from the 2012 and 2007 Commodity Flow Surveys)
|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.