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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]
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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 |
8.3 |
– |
17.7 |
– |
17.4 |
– |
11.2 |
Less than 50 lbs |
21.9 |
2.6 |
12.2 |
– |
16.3 |
0.2 |
11.5 |
50 to 99 lbs |
24.1 |
0.7 |
11.7 |
– |
16.4 |
0.1 |
12.8 |
100 to 499 lbs |
14.9 |
2.3 |
13.2 |
0.6 |
14.4 |
1.0 |
13.7 |
500 to 749 lbs |
17.9 |
0.5 |
8.6 |
0.1 |
13.0 |
0.2 |
16.6 |
750 to 999 lbs |
36.0 |
0.5 |
13.8 |
0.1 |
18.3 |
0.2 |
17.6 |
1,000 to 9,999 lbs |
11.1 |
1.9 |
15.2 |
1.6 |
12.2 |
1.4 |
17.3 |
10,000 to 49,999 lbs |
10.4 |
2.7 |
18.7 |
3.8 |
19.6 |
5.4 |
14.1 |
50,000 to 99,999 lbs |
34.5 |
2.3 |
19.4 |
4.3 |
22.8 |
1.8 |
16.5 |
100,000 lbs or more |
22.4 |
0.3 |
45.5 |
4.7 |
48.0 |
6.0 |
19.3 |
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 |
7.9 |
– |
18.4 |
– |
18.5 |
– |
20.8 |
Less than 50 lbs |
26.1 |
1.1 |
18.5 |
– |
23.1 |
– |
44.8 |
50 to 99 lbs |
14.5 |
0.4 |
10.5 |
– |
15.4 |
– |
16.5 |
100 to 499 lbs |
18.1 |
2.4 |
13.6 |
0.5 |
17.6 |
0.9 |
17.6 |
500 to 749 lbs |
19.5 |
0.6 |
11.2 |
0.1 |
12.9 |
0.2 |
21.6 |
750 to 999 lbs |
38.9 |
0.8 |
13.8 |
0.1 |
19.5 |
0.2 |
19.8 |
1,000 to 9,999 lbs |
12.0 |
2.1 |
15.7 |
1.7 |
12.2 |
1.7 |
18.0 |
10,000 to 49,999 lbs |
11.3 |
3.4 |
19.2 |
3.8 |
19.9 |
5.5 |
14.2 |
50,000 to 99,999 lbs |
20.9 |
1.4 |
19.7 |
4.4 |
24.2 |
1.7 |
18.3 |
100,000 lbs or more |
23.4 |
0.4 |
45.8 |
4.8 |
49.5 |
6.1 |
18.5 |
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 |
7.6 |
– |
13.1 |
– |
15.8 |
– |
23.8 |
Less than 50 lbs |
18.8 |
0.6 |
18.5 |
– |
35.9 |
– |
S |
50 to 99 lbs |
12.5 |
0.2 |
10.8 |
– |
18.5 |
– |
18.7 |
100 to 499 lbs |
18.8 |
2.5 |
13.7 |
0.5 |
17.9 |
0.9 |
17.9 |
500 to 749 lbs |
19.4 |
0.7 |
11.2 |
0.1 |
13.2 |
0.2 |
21.9 |
750 to 999 lbs |
39.6 |
1.1 |
13.8 |
0.1 |
19.5 |
0.2 |
19.8 |
1,000 to 9,999 lbs |
12.9 |
2.1 |
15.7 |
1.5 |
12.2 |
1.4 |
18.2 |
10,000 to 49,999 lbs |
11.0 |
3.4 |
19.6 |
4.1 |
20.3 |
3.8 |
13.1 |
50,000 to 99,999 lbs |
21.0 |
1.1 |
19.8 |
4.6 |
27.0 |
2.3 |
16.7 |
100,000 lbs or more |
33.7 |
0.4 |
36.2 |
2.6 |
39.5 |
1.7 |
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 |
47.1 |
– |
S |
S |
49.0 |
– |
27.6 |
Less than 50 lbs |
– |
– |
– |
– |
– |
– |
– |
50 to 99 lbs |
– |
– |
– |
– |
– |
– |
– |
100 to 499 lbs |
S |
S |
S |
S |
S |
S |
31.6 |
500 to 749 lbs |
– |
– |
– |
– |
– |
– |
– |
750 to 999 lbs |
– |
– |
– |
– |
– |
– |
– |
1,000 to 9,999 lbs |
S |
S |
49.5 |
– |
S |
S |
26.9 |
10,000 to 49,999 lbs |
S |
S |
S |
S |
S |
S |
21.7 |
50,000 to 99,999 lbs |
S |
S |
34.0 |
11.9 |
42.0 |
12.4 |
22.8 |
100,000 lbs or more |
S |
S |
S |
S |
S |
S |
17.3 |
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 |
33.0 |
– |
37.4 |
– |
28.1 |
– |
5.8 |
Less than 50 lbs |
S |
S |
31.7 |
4.9 |
30.4 |
4.9 |
6.9 |
50 to 99 lbs |
46.1 |
4.2 |
48.6 |
1.0 |
S |
S |
10.4 |
100 to 499 lbs |
33.0 |
6.8 |
43.6 |
10.9 |
42.8 |
9.0 |
12.0 |
500 to 749 lbs |
S |
S |
S |
S |
S |
S |
22.5 |
750 to 999 lbs |
S |
S |
46.1 |
1.9 |
S |
S |
30.2 |
1,000 to 9,999 lbs |
S |
S |
S |
S |
S |
S |
18.2 |
10,000 to 49,999 lbs |
S |
S |
S |
S |
S |
S |
31.6 |
50,000 to 99,999 lbs |
S |
S |
S |
S |
S |
S |
31.6 |
100,000 lbs or more |
48.2 |
0.5 |
S |
S |
44.2 |
12.7 |
25.9 |
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 |
20.2 |
– |
20.2 |
– |
23.7 |
– |
9.8 |
Less than 50 lbs |
23.1 |
4.9 |
21.1 |
5.5 |
17.4 |
4.2 |
10.7 |
50 to 99 lbs |
37.0 |
1.8 |
24.7 |
2.0 |
23.8 |
1.9 |
9.1 |
100 to 499 lbs |
14.9 |
2.9 |
25.1 |
3.7 |
24.5 |
4.4 |
8.0 |
500 to 749 lbs |
35.5 |
1.2 |
30.2 |
1.4 |
31.3 |
0.8 |
S |
750 to 999 lbs |
S |
S |
42.2 |
0.3 |
S |
S |
27.6 |
1,000 to 9,999 lbs |
45.1 |
0.4 |
41.1 |
0.6 |
S |
S |
26.4 |
10,000 to 49,999 lbs |
22.4 |
0.3 |
46.7 |
8.2 |
46.1 |
8.5 |
23.2 |
50,000 to 99,999 lbs |
S |
S |
S |
S |
S |
S |
31.6 |
100,000 lbs or more |
S |
S |
S |
S |
S |
S |
29.8 |
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 |
20.6 |
– |
19.6 |
– |
20.0 |
– |
10.0 |
Less than 50 lbs |
23.1 |
4.8 |
21.1 |
5.2 |
17.4 |
5.1 |
10.7 |
50 to 99 lbs |
37.0 |
1.8 |
24.6 |
1.9 |
23.8 |
2.3 |
9.9 |
100 to 499 lbs |
15.0 |
3.0 |
25.6 |
3.4 |
26.5 |
4.2 |
6.9 |
500 to 749 lbs |
35.7 |
1.3 |
30.3 |
2.6 |
32.0 |
2.0 |
S |
750 to 999 lbs |
S |
S |
42.7 |
0.9 |
S |
S |
27.5 |
1,000 to 9,999 lbs |
S |
S |
S |
S |
S |
S |
31.6 |
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 |
27.9 |
– |
32.6 |
– |
33.7 |
– |
18.0 |
Less than 50 lbs |
– |
– |
– |
– |
– |
– |
– |
50 to 99 lbs |
S |
S |
S |
S |
S |
S |
31.6 |
100 to 499 lbs |
S |
S |
S |
S |
S |
S |
24.7 |
500 to 749 lbs |
S |
S |
S |
S |
S |
S |
31.6 |
750 to 999 lbs |
S |
S |
S |
S |
S |
S |
31.6 |
1,000 to 9,999 lbs |
46.8 |
8.6 |
48.5 |
4.7 |
S |
S |
23.5 |
10,000 to 49,999 lbs |
22.4 |
10.9 |
46.7 |
12.0 |
46.1 |
13.1 |
23.2 |
50,000 to 99,999 lbs |
S |
S |
S |
S |
S |
S |
31.6 |
100,000 lbs or more |
S |
S |
S |
S |
S |
S |
29.8 |
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 |
49.1 |
– |
30.5 |
– |
35.3 |
– |
26.8 |
Less than 50 lbs |
40.3 |
6.9 |
34.1 |
1.1 |
S |
S |
28.8 |
50 to 99 lbs |
31.8 |
1.0 |
34.0 |
0.3 |
S |
S |
48.9 |
100 to 499 lbs |
45.2 |
4.6 |
43.2 |
3.0 |
S |
S |
S |
500 to 749 lbs |
46.4 |
0.6 |
47.2 |
0.8 |
S |
S |
S |
750 to 999 lbs |
49.6 |
0.9 |
S |
S |
S |
S |
S |
1,000 to 9,999 lbs |
24.0 |
9.7 |
17.7 |
7.4 |
23.7 |
7.3 |
25.9 |
10,000 to 49,999 lbs |
S |
S |
25.3 |
6.6 |
41.9 |
8.7 |
34.5 |
50,000 to 99,999 lbs |
S |
S |
S |
S |
S |
S |
31.8 |
100,000 lbs or more |
S |
S |
S |
S |
S |
S |
31.6 |
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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