Table B-1b. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by Mode of Transportation: 2002 and 1997
Monday, July 2, 2012
Table B-1b. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by Mode of Transportation: 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 |
|
| All modes | 3.0 | 3.4 | 5.7 | 4.2 | 2.8 | 6.2 | 4.4 | 5.5 | 7.8 | 7.1 | 7.6 | 12.9 |
| Single modes | 3.1 | 3.4 | 5.8 | 4.2 | 2.8 | 6.2 | 4.9 | 5.7 | 8.5 | 6.1 | 6.7 | 10.6 |
| Truck | 3.7 | 3.5 | 6.5 | 4.6 | 4.5 | 7.8 | 7.0 | 8.5 | 14.8 | 6.3 | 5.0 | 10.0 |
| For-hire truck | 5.2 | 6.3 | 10.8 | 6.2 | 7.5 | 11.8 | 9.4 | 12.7 | 20.9 | 7.4 | 5.5 | 10.4 |
| Private truck | 4.8 | 3.1 | 7.4 | 5.3 | 3.3 | 7.7 | 7.9 | 9.0 | 16.6 | 5.3 | 4.1 | 7.2 |
| Rail | 7.7 | 15.5 | 15.5 | 6.6 | 8.9 | 11.9 | 5.8 | 12.2 | 12.4 | 2.6 | 6.0 | 5.4 |
| Water | 12.5 | 11.3 | 23.9 | 14.3 | 13.2 | 26.5 | 12.0 | 14.5 | 21.0 | S | S | S |
| Air (includes truck and air) | 20.7 | 46.4 | 9.7 | 38.0 | 19.2 | 37.2 | 39.2 | 20.1 | 37.3 | 8.2 | 3.5 | 12.8 |
| Pipeline | 6.6 | 5.1 | 11.2 | 7.0 | 6.3 | 11.9 | S | S | S | S | S | S |
| Multiple modes | 14.9 | 11.1 | 24.8 | 24.3 | 25.4 | 53.8 | 19.9 | S | S | 12.8 | 8.9 | 20.3 |
| Parcel, U.S.P.S. or courier | 14.6 | 11.6 | 25.0 | 20.2 | 25.3 | 39.3 | 13.0 | 16.4 | 26.6 | 13.2 | 8.1 | 18.6 |
| Other multiple modes | 23.6 | 14.5 | 37.0 | 24.7 | 25.6 | 54.6 | 20.1 | S | S | 22.6 | 44.0 | 404.9 |
| Other and unknown modes | 18.7 | 12.5 | 15.1 | 19.0 | 9.5 | 15.7 | 46.0 | 20.4 | 62.5 | 39.0 | 33.1 | 88.6 |
KEY:
–
Represents and estimate equal to zero or less than 1 unit of
measure.
S Estimate does not meet publication standards because of highly sampling
variability or poor response quality.
CV Coefficient of variation of number
NOTE: 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, Hazmat Data, December 2004.