Table B–11b. Estimated Measures of Reliability for Shipment Characteristics by Mode of Transportation for the United States: 2002 and 1993
[Estimates are based on data from the 2002 and 1993 Commodity Flow Surveys. Because of rounding, estimates may not be additive]
| Mode of transportation | Value | Tons | Ton-miles | Average miles per shipment | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CV 2002 |
CV 1993 |
Std. error of percent | CV 2002 |
CV 1993 |
Std. error of percent | CV 2002 |
CV 1993 |
Std. error of percent | CV 2002 |
CV 1993 |
Std. error of percent | |
| Total | 1.3 | 0.8 | 2.2 | 2.0 | 1.6 | 3.1 | 3.7 | 2.7 | 6.0 | 2.9 | 3.0 | 5.4 |
| Single modes | 1.4 | 0.9 | 2.4 | 2.1 | 1.6 | 3.2 | 3.1 | 2.7 | 5.5 | 7.0 | 4.6 | 10.2 |
| Truck | 1.4 | 1.1 | 2.5 | 2.6 | 1.9 | 3.9 | 2.8 | 1.9 | 4.9 | 3.7 | 1.5 | 4.8 |
| Rail | 6.0 | 3.3 | 8.6 | 5.7 | 3.8 | 8.3 | 6.7 | 4.5 | 10.8 | 6.7 | 1.9 | 7.3 |
| Water | 6.4 | 6.9 | 13.7 | 6.8 | 8.0 | 14.1 | 7.4 | 9.5 | 12.5 | 16.5 | S | S |
| Air (includes truck and air) | 11.6 | 5.2 | 24.2 | 11.6 | 12.7 | 20.6 | 15.5 | 8.1 | 25.5 | 4.2 | 2.7 | 6.8 |
| Pipeline | 6.4 | 9.7 | 19.3 | 6.9 | 10.7 | 18.0 | S | S | S | S | S | S |
| Multiple modes | 3.3 | 2.5 | 6.7 | 10.0 | 6.6 | 11.5 | 16.5 | 10.7 | 23.2 | 2.2 | 2.9 | 4.5 |
| Parcel, U.S.P.S. or courier | 3.3 | 1.6 | 6.4 | 4.4 | 2.4 | 6.7 | 4.2 | 3.8 | 8.1 | 2.3 | 3.0 | 4.5 |
| Truck and rail | 13.2 | 15.6 | 17.2 | 12.3 | 9.4 | 16.4 | 7.1 | 9.1 | 13.9 | 3.1 | 6.0 | 6.8 |
| Other multiple modes | 18.8 | 9.8 | 28.0 | 15.2 | 8.4 | 15.4 | 23.6 | 14.8 | 32.0 | 10.8 | 7.2 | 15.9 |
| Other and unknown modes | 3.0 | 5.2 | 6.6 | 12.6 | 7.7 | 9.9 | 9.7 | 11.6 | 7.2 | 13.0 | 12.6 | 10.3 |
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.