Table B–2b. Estimated Measures of Reliability for Shipment Characteristics by Total Modal Activity 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]
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| Total |
3.7 |
2.3 |
5.3 |
2.8 |
2.6 |
4.3 |
| Truck |
2.8 |
1.7 |
4.1 |
3.6 |
2.8 |
4.9 |
| Rail |
7.6 |
5.3 |
11.3 |
6.1 |
2.6 |
6.6 |
| Shallow draft |
9.4 |
5.5 |
12.9 |
13.1 |
20.9 |
44.5 |
| Great Lakes |
18.1 |
14.1 |
29.5 |
16.0 |
10.8 |
17.7 |
| Deep draft |
17.3 |
17.3 |
26.2 |
11.1 |
13.0 |
19.2 |
| Air |
15.7 |
7.8 |
17.1 |
4.3 |
1.8 |
6.6 |
| Parcel, U.S.P.S. or
courier |
4.2 |
4.0 |
6.6 |
2.3 |
2.6 |
3.8 |
| Pipeline |
S |
S |
S |
S |
S |
S |
| Other and unknown modes |
9.7 |
8.5 |
7.8 |
13.0 |
9.6 |
17.2 |
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.
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