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Table B-2b. Estimated Measures of Reliability for Hazardous Material
Shipment Characteristics by Hazard Class: 2002 and 1997
[Estimates are shown as percents and are based on data from the
2002 and 1997 Commodity Flow Surveys]
Excel | CSV
| Total |
3.0 |
3.4 |
5.7 |
4.2 |
2.8 |
6.2 |
4.4 |
5.5 |
7.8 |
7.1 |
7.6 |
12.9 |
| Class 1, Explosives |
23.8 |
7.3 |
35.3 |
43.2 |
21.7 |
140.7 |
29.5 |
S |
S |
10.9 |
8.4 |
11.6 |
| Class 2, Gases |
7.9 |
6.1 |
15.7 |
15.6 |
5.0 |
25.5 |
8.9 |
13.8 |
23.5 |
29.0 |
12.8 |
50.4 |
| Class 3, Flammable
liquids |
3.7 |
3.4 |
6.4 |
4.3 |
3.0 |
6.5 |
5.2 |
9.4 |
12.7 |
12.2 |
6.3 |
21.3 |
| Class 4, Flammable solids |
22.1 |
8.1 |
36.5 |
8.8 |
22.8 |
18.7 |
14.0 |
35.1 |
17.1 |
46.3 |
15.0 |
11.7 |
| Class 5, Oxidizers and
organic peroxides |
21.8 |
13.7 |
31.4 |
26.8 |
12.1 |
40.3 |
25.3 |
18.7 |
29.7 |
18.7 |
13.9 |
49.2 |
| Class 6, Toxic (poison) |
11.6 |
8.8 |
11.9 |
15.9 |
16.4 |
30.3 |
22.2 |
10.9 |
37.2 |
21.3 |
13.4 |
39.0 |
| Class 7, Radioactive
materials |
39.0 |
20.9 |
95.2 |
31.2 |
24.0 |
25.6 |
31.7 |
26.7 |
37.7 |
S |
27.7 |
S |
| Class 8, Corrosive
materials |
6.9 |
20.3 |
19.9 |
9.7 |
8.1 |
11.7 |
10.1 |
17.2 |
16.9 |
14.9 |
18.6 |
34.9 |
| Class 9, Miscellaneous
dangerous goods |
13.4 |
7.6 |
15.2 |
20.6 |
14.1 |
23.3 |
11.8 |
12.7 |
15.4 |
9.3 |
8.8 |
14.6 |
KEY:
– Represents and estimate equal to zero or less than 1 unit of
measure.
S Estimate does not meet publication standards b ecause 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.
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