Table B-1a. Estimated Measures of Reliability for Shipment Characteristics by Mode of Transportation for the United States: 2002
Monday, July 2, 2012
Table B-1a. Estimated Measures of Reliability for Shipment Characteristics by Mode of Transportation for the United States: 2002
[Estimates are shown as percents and are based on data from the 2002 Commodity Flow Survey]
| Mode of Transportation | Value | Tons | Ton-miles | CV of Average miles per shipment | |||
|---|---|---|---|---|---|---|---|
| CV | Std. error of percent | CV | Std. error of percent | CV | Std. error of percent | ||
| Total | 1.3 | – | 2.0 | – | 3.7 | – | 2.9 |
| Single modes | 1.4 | 0.3 | 2.1 | 0.5 | 3.1 | 0.7 | 7.0 |
| Truck | 1.4 | 0.4 | 2.6 | 1.0 | 2.8 | 1.5 | 3.7 |
| For-hire truck | 2.3 | 0.6 | 3.6 | 1.0 | 3.1 | 1.2 | 2.6 |
| Private truck | 1.6 | 0.5 | 3.4 | 0.8 | 3.9 | 0.4 | 4.2 |
| Rail | 6.0 | 0.2 | 5.7 | 0.7 | 6.7 | 1.3 | 6.7 |
| Water | 6.4 | – | 6.8 | 0.4 | 7.4 | 0.7 | 16.5 |
| Shallow draft | 8.6 | – | 7.9 | 0.3 | 10.3 | 0.7 | 15.2 |
| Great Lakes | 29.1 | – | 22.3 | – | 24.5 | 0.1 | 15.0 |
| Deep draft | 15.4 | – | 18.0 | 0.3 | 19.2 | 0.4 | 28.6 |
| Air (incl truck and air) | 11.6 | 0.4 | 11.6 | – | 15.5 | – | 4.2 |
| Pipeline | 6.4 | 0.1 | 6.9 | 0.4 | S | S | S |
| Multiple modes | 3.3 | 0.4 | 10.0 | 0.2 | 16.5 | 0.8 | 2.2 |
| Parcel, U.S.P.S. or courier | 3.3 | 0.3 | 4.4 | – | 4.2 | – | 2.3 |
| Truck and rail | 13.2 | 0.1 | 12.3 | – | 7.1 | 0.1 | 3.1 |
| Truck and water | 26.4 | – | 16.6 | – | 18.5 | 0.2 | 9.4 |
| Rail and water | 16.6 | – | 23.0 | 0.2 | 35.1 | 0.9 | 21.0 |
| Other multiple modes | 31.8 | – | 30.7 | – | 25.2 | 0.1 | S |
| Other and unknown modes | 3.0 | 0.1 | 12.6 | 0.4 | 9.7 | 0.2 | 13.0 |
KEY:
– Represents data cell equal to zero or less than 1 unit of measure.
S Estimate does not meet publication standards because of high sampling variability or poor response quality.
CV Coefficient of variation of number.
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: Bureau of Transportation Statistics (USDOT) and U.S. Census Bureau, 2002 Commodity Flow Survey, United States Data, December 2004.