Table B-11a. Estimated Measures of Reliability for Shipment Characteristics by Mode of Transportation for the United States: 2002 and 1997
Monday, July 2, 2012
Table B-11a. Estimated Measures of Reliability for Shipment Characteristics by Mode of Transportation for the United States: 2002 and 1997
[Estimates are shown as percents and are based on data from the 2002 and 1997 Commodity Flow Surveys]
| Mode of transportation | Value | Tons | Ton-miles | Average miles per shipment | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CV 2002 |
CV 1997 |
Std. error of percent change | CV 2002 |
CV 1997 |
Std. error of percent change | CV 2002 |
CV 1997 |
Std. error of percent change | CV 2002 |
CV 1997 |
Std. error of percent change | |
| Total | 1.3 | 0.9 | 2.0 | 2.0 | 1.6 | 2.8 | 3.7 | 2.3 | 5.3 | 2.9 | 2.6 | 4.4 |
| Single modes | 1.4 | 1.1 | 2.3 | 2.1 | 1.5 | 2.9 | 3.1 | 2.6 | 5.0 | 7.0 | 3.0 | 9.1 |
| Truck | 1.4 | 1.0 | 2.2 | 2.6 | 1.7 | 3.3 | 2.8 | 1.8 | 4.1 | 3.7 | 2.9 | 5.2 |
| Rail | 6.0 | 5.1 | 7.7 | 5.7 | 4.0 | 8.5 | 6.7 | 5.5 | 10.7 | 6.7 | 3.1 | 7.6 |
| Water | 6.4 | 4.8 | 9.4 | 6.8 | 4.7 | 10.4 | 7.4 | 6.1 | 11.3 | 16.5 | 29.9 | 40.1 |
| Air (includes truck and air) | 11.6 | 7.0 | 15.7 | 11.6 | 5.7 | 11.1 | 15.5 | 7.7 | 16.5 | 4.2 | 1.7 | 6.3 |
| Pipeline | 6.4 | 7.0 | 12.4 | 6.9 | 7.7 | 12.9 | S | S | S | S | S | S |
| Multiple modes | 3.3 | 1.8 | 4.4 | 10.0 | 7.3 | 12.6 | 16.5 | 9.6 | 21.3 | 2.2 | 2.6 | 3.8 |
| Parcel, U.S.P.S. or courier | 3.3 | 2.0 | 4.6 | 4.4 | 2.7 | 5.9 | 4.2 | 4.0 | 6.6 | 2.3 | 2.6 | 3.8 |
| Truck and rail | 13.2 | 7.5 | 14.1 | 12.3 | 19.8 | 18.6 | 7.1 | 18.2 | 16.1 | 3.1 | 2.6 | 4.2 |
| Other multiple modes | 18.8 | 8.8 | 31.2 | 15.2 | 10.8 | 20.1 | 23.6 | 14.2 | 34.1 | 10.8 | 9.5 | 23.2 |
| Other and unknown modes | 3.0 | 3.4 | 4.4 | 12.6 | 8.4 | 13.0 | 9.7 | 8.5 | 7.9 | 13.0 | 9.6 | 17.1 |
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.