Table B-19. Estimated Measures of Reliability for Shipment Characteristics of Temperature Controlled Shipments (1) by Shipment Weight for the United States: 2012
(Estimates are based on data from the 2012 Commodity Flow Survey)
|Shipment weight||Value||Tons||Ton-miles (2)||Average miles per shipment|
|Coefficient of||Standard error of percent of total||Coefficient of||Standard error of percent of total||Coefficient of||Standard error of percent of total||coefficient of|
|variation of number||variation of number||variation of number||variation of number|
|Less than 50 lbs.||8||0.5||8.4||Z||12.6||Z||10.6|
|50 to 99 lbs.||13.6||0.3||10.1||Z||15.2||Z||14|
|100 to 499 lbs.||6.8||0.5||5.7||0.1||6.1||Z||6.7|
|500 to 749 lbs.||7.9||0.2||3.6||0.1||4.7||Z||3.5|
|750 to 999 lbs.||6.5||0.1||2.5||Z||3.4||Z||3.4|
|1,000 to 9,999 lbs.||5.4||0.8||4||0.7||3.2||0.4||3|
|10,000 to 49,999 lbs.||2.5||1||2.3||1.1||2.6||0.9||2.6|
|50,000 to 99,999 lbs.||15.8||0.4||14.5||1.3||12.2||0.5||9.7|
|100,000 lbs. or more||7.1||0.2||10.8||0.8||7.5||1.3||8.5|
KEY: Z = Rounds to zero.
(1) Shipments that are temperature controlled are transported in a vehicle or container that regulates or maintains the temperature when en route to its destination.
(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 <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.