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Table B–4. Estimated Measures of Reliability for Shipment Characteristics by Mode of Transportation and Shipment Size for CBSA of Origin: 2002
[Estimates are based on data from the Commodity Flow Survey. Because of rounding, estimates may not be additive]
Excel | CSV
All modes
Shipment Weight |
Value |
Tons |
Ton-miles |
CV of average miles per shipment |
CV |
Std. error of percent |
CV |
Std. error of percent |
CV |
Std. error of percent |
All shipment sizes |
40.4 |
– |
21.3 |
– |
21.0 |
– |
S |
Less than 50 lbs |
17.2 |
2.3 |
25.0 |
– |
43.6 |
1.7 |
38.0 |
50 to 99 lbs |
45.4 |
2.9 |
34.8 |
– |
35.1 |
0.1 |
29.5 |
100 to 499 lbs |
25.3 |
4.2 |
33.9 |
0.4 |
29.5 |
0.3 |
16.6 |
500 to 749 lbs |
42.8 |
0.6 |
S |
S |
40.1 |
0.2 |
35.1 |
750 to 999 lbs |
42.9 |
0.4 |
S |
S |
41.8 |
0.1 |
33.6 |
1,000 to 9,999 lbs |
S |
S |
S |
S |
44.5 |
3.3 |
30.7 |
10,000 to 49,999 lbs |
S |
S |
24.8 |
7.4 |
26.5 |
6.7 |
31.7 |
50,000 to 99,999 lbs |
S |
S |
36.3 |
1.5 |
27.9 |
0.8 |
47.9 |
100,000 lbs or more |
S |
S |
S |
S |
S |
S |
S |
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
NOTE: The Introduction and appendixes give
information onf 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, Metropolitan Data,
December 2004.
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