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]
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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 |
10.8 |
– |
14.9 |
– |
16.7 |
– |
24.6 |
Less than 50 lbs |
19.6 |
3.1 |
29.5 |
– |
31.0 |
0.2 |
24.2 |
50 to 99 lbs |
29.5 |
0.7 |
S |
S |
40.2 |
– |
S |
100 to 499 lbs |
13.8 |
1.1 |
32.4 |
0.2 |
19.2 |
0.2 |
39.5 |
500 to 749 lbs |
31.7 |
0.8 |
30.0 |
– |
22.9 |
0.1 |
18.1 |
750 to 999 lbs |
22.2 |
0.6 |
25.7 |
– |
21.1 |
0.1 |
23.0 |
1,000 to 9,999 lbs |
24.1 |
3.7 |
14.4 |
0.8 |
15.5 |
3.0 |
13.4 |
10,000 to 49,999 lbs |
10.4 |
2.6 |
22.0 |
4.1 |
19.8 |
4.7 |
28.8 |
50,000 to 99,999 lbs |
18.5 |
1.5 |
14.5 |
4.1 |
14.8 |
2.3 |
20.3 |
100,000 lbs or more |
46.3 |
0.3 |
S |
S |
S |
S |
S |
Single 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 |
11.6 |
– |
15.0 |
– |
16.6 |
– |
29.8 |
Less than 50 lbs |
7.2 |
1.0 |
40.8 |
– |
25.2 |
– |
S |
50 to 99 lbs |
37.2 |
0.8 |
S |
S |
43.4 |
– |
S |
100 to 499 lbs |
15.2 |
1.5 |
33.6 |
0.2 |
16.0 |
0.2 |
31.9 |
500 to 749 lbs |
35.1 |
0.9 |
31.0 |
– |
22.3 |
0.1 |
20.0 |
750 to 999 lbs |
23.4 |
0.6 |
27.7 |
– |
24.1 |
0.1 |
15.1 |
1,000 to 9,999 lbs |
24.5 |
3.6 |
14.5 |
0.8 |
15.5 |
3.1 |
13.8 |
10,000 to 49,999 lbs |
10.3 |
2.7 |
22.0 |
4.1 |
19.7 |
4.7 |
28.9 |
50,000 to 99,999 lbs |
19.2 |
1.8 |
14.5 |
4.1 |
15.0 |
2.3 |
20.6 |
100,000 lbs or more |
44.9 |
0.4 |
S |
S |
S |
S |
S |
Truck
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 |
12.3 |
– |
15.3 |
– |
15.9 |
– |
18.8 |
Less than 50 lbs |
18.6 |
1.0 |
42.2 |
– |
49.0 |
– |
33.5 |
50 to 99 lbs |
46.7 |
0.8 |
S |
S |
S |
S |
32.2 |
100 to 499 lbs |
14.9 |
1.5 |
34.2 |
0.2 |
18.6 |
0.2 |
22.9 |
500 to 749 lbs |
35.2 |
1.0 |
30.9 |
– |
21.8 |
0.1 |
20.5 |
750 to 999 lbs |
23.1 |
0.6 |
27.7 |
– |
24.3 |
0.1 |
15.4 |
1,000 to 9,999 lbs |
24.8 |
3.7 |
14.6 |
0.8 |
15.6 |
3.0 |
13.7 |
10,000 to 49,999 lbs |
10.1 |
2.8 |
22.0 |
4.0 |
19.9 |
4.5 |
29.4 |
50,000 to 99,999 lbs |
19.2 |
2.0 |
14.5 |
4.1 |
14.9 |
2.5 |
20.6 |
100,000 lbs or more |
S |
S |
S |
S |
43.0 |
0.3 |
S |
Rail
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 |
S |
S |
S |
S |
S |
S |
S |
Less than 50 lbs |
– |
– |
– |
– |
– |
– |
– |
50 to 99 lbs |
– |
– |
– |
– |
– |
– |
– |
100 to 499 lbs |
– |
– |
– |
– |
– |
– |
– |
500 to 749 lbs |
– |
– |
– |
– |
– |
– |
– |
750 to 999 lbs |
– |
– |
– |
– |
– |
– |
– |
1,000 to 9,999 lbs |
– |
– |
– |
– |
– |
– |
– |
10,000 to 49,999 lbs |
S |
S |
S |
S |
S |
S |
30.2 |
50,000 to 99,999 lbs |
– |
– |
– |
– |
– |
– |
– |
100,000 lbs or more |
S |
S |
S |
S |
S |
S |
S |
All other Single 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 |
26.4 |
– |
29.1 |
– |
35.9 |
– |
5.2 |
Less than 50 lbs |
33.0 |
12.1 |
27.1 |
14.2 |
28.1 |
14.4 |
11.4 |
50 to 99 lbs |
S |
S |
46.2 |
1.6 |
49.4 |
1.5 |
40.3 |
100 to 499 lbs |
48.1 |
10.3 |
32.0 |
9.9 |
34.3 |
9.4 |
27.4 |
500 to 749 lbs |
S |
S |
S |
S |
S |
S |
31.6 |
750 to 999 lbs |
S |
S |
S |
S |
S |
S |
27.9 |
1,000 to 9,999 lbs |
S |
S |
49.1 |
5.8 |
S |
S |
26.6 |
10,000 to 49,999 lbs |
S |
S |
S |
S |
S |
S |
30.5 |
50,000 to 99,999 lbs |
S |
S |
S |
S |
S |
S |
31.6 |
100,000 lbs or more |
– |
– |
– |
– |
– |
– |
– |
Multiple 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 |
20.3 |
– |
25.0 |
– |
42.9 |
– |
13.5 |
Less than 50 lbs |
27.9 |
7.4 |
28.5 |
8.8 |
35.6 |
7.4 |
13.1 |
50 to 99 lbs |
22.9 |
2.1 |
30.5 |
4.1 |
46.4 |
3.7 |
18.0 |
100 to 499 lbs |
29.4 |
5.9 |
32.7 |
3.9 |
S |
S |
18.2 |
500 to 749 lbs |
47.3 |
1.9 |
S |
S |
S |
S |
S |
750 to 999 lbs |
S |
S |
S |
S |
S |
S |
S |
1,000 to 9,999 lbs |
S |
S |
S |
S |
S |
S |
S |
10,000 to 49,999 lbs |
S |
S |
S |
S |
S |
S |
31.6 |
50,000 to 99,999 lbs |
– |
– |
– |
– |
– |
– |
– |
100,000 lbs or more |
– |
– |
– |
– |
– |
– |
– |
Parcel, USPS or courier
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 |
20.5 |
– |
26.9 |
– |
42.9 |
– |
13.6 |
Less than 50 lbs |
27.9 |
7.3 |
28.5 |
8.3 |
35.6 |
7.9 |
13.1 |
50 to 99 lbs |
22.9 |
2.1 |
30.5 |
4.0 |
46.4 |
3.6 |
18.0 |
100 to 499 lbs |
29.4 |
6.0 |
32.7 |
3.6 |
S |
S |
18.2 |
500 to 749 lbs |
47.3 |
1.9 |
S |
S |
S |
S |
S |
750 to 999 lbs |
S |
S |
S |
S |
S |
S |
S |
1,000 to 9,999 lbs |
– |
– |
– |
– |
– |
– |
– |
10,000 to 49,999 lbs |
– |
– |
– |
– |
– |
– |
– |
50,000 to 99,999 lbs |
– |
– |
– |
– |
– |
– |
– |
100,000 lbs or more |
– |
– |
– |
– |
– |
– |
– |
All other multiple 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 |
S |
S |
S |
S |
S |
S |
S |
Less than 50 lbs |
– |
– |
– |
– |
– |
– |
– |
50 to 99 lbs |
– |
– |
– |
– |
– |
– |
– |
100 to 499 lbs |
– |
– |
– |
– |
– |
– |
– |
500 to 749 lbs |
– |
– |
– |
– |
– |
– |
– |
750 to 999 lbs |
– |
– |
– |
– |
– |
– |
– |
1,000 to 9,999 lbs |
S |
S |
S |
S |
S |
S |
S |
10,000 to 49,999 lbs |
S |
S |
S |
S |
S |
S |
31.6 |
50,000 to 99,999 lbs |
– |
– |
– |
– |
– |
– |
– |
100,000 lbs or more |
– |
– |
– |
– |
– |
– |
– |
Other and unknown 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 |
24.6 |
– |
26.6 |
– |
49.5 |
– |
S |
Less than 50 lbs |
41.7 |
6.6 |
44.6 |
1.6 |
46.2 |
2.3 |
S |
50 to 99 lbs |
S |
S |
36.9 |
1.4 |
32.5 |
0.6 |
S |
100 to 499 lbs |
S |
S |
S |
S |
S |
S |
25.3 |
500 to 749 lbs |
S |
S |
S |
S |
S |
S |
28.4 |
750 to 999 lbs |
S |
S |
S |
S |
S |
S |
29.9 |
1,000 to 9,999 lbs |
38.8 |
13.6 |
48.3 |
15.1 |
S |
S |
S |
10,000 to 49,999 lbs |
S |
S |
S |
S |
S |
S |
31.1 |
50,000 to 99,999 lbs |
S |
S |
S |
S |
47.1 |
10.8 |
29.1 |
100,000 lbs or more |
S |
S |
S |
S |
S |
S |
28.5 |
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.
Find this web page at:
http://www.bts.gov/publications/commodity_flow_survey/2002/metropolitan_areas/washington_baltimore_northern_virginia_dc_md_va_wv_csa_va_part/html/table_b_04.html
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