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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 |
10.1 |
– |
22.4 |
– |
12.8 |
– |
13.3 |
Less than 50 lbs |
16.7 |
2.2 |
35.1 |
0.1 |
49.6 |
0.4 |
12.3 |
50 to 99 lbs |
19.6 |
0.5 |
17.6 |
– |
20.0 |
– |
13.1 |
100 to 499 lbs |
22.9 |
1.3 |
17.9 |
0.2 |
12.6 |
0.2 |
25.8 |
500 to 749 lbs |
20.0 |
0.3 |
20.2 |
– |
11.2 |
– |
34.4 |
750 to 999 lbs |
38.0 |
0.7 |
20.8 |
0.2 |
12.2 |
0.1 |
28.5 |
1,000 to 9,999 lbs |
15.0 |
1.6 |
18.1 |
1.1 |
8.3 |
1.0 |
20.8 |
10,000 to 49,999 lbs |
21.6 |
7.0 |
23.9 |
5.2 |
13.5 |
7.0 |
23.0 |
50,000 to 99,999 lbs |
34.7 |
2.0 |
40.7 |
3.8 |
18.0 |
0.7 |
S |
100,000 lbs or more |
38.3 |
4.2 |
32.1 |
2.7 |
35.0 |
7.1 |
17.3 |
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 |
11.6 |
– |
22.8 |
– |
13.0 |
– |
14.1 |
Less than 50 lbs |
46.0 |
1.2 |
35.8 |
– |
49.1 |
– |
14.3 |
50 to 99 lbs |
35.6 |
0.3 |
22.3 |
– |
28.9 |
– |
19.2 |
100 to 499 lbs |
25.7 |
1.0 |
22.3 |
0.2 |
14.1 |
0.1 |
31.0 |
500 to 749 lbs |
21.7 |
0.3 |
22.7 |
0.1 |
12.6 |
– |
42.4 |
750 to 999 lbs |
39.3 |
0.9 |
21.4 |
0.2 |
14.5 |
0.1 |
37.0 |
1,000 to 9,999 lbs |
15.2 |
1.6 |
18.3 |
1.0 |
8.4 |
1.0 |
20.5 |
10,000 to 49,999 lbs |
21.5 |
8.2 |
24.1 |
5.3 |
13.3 |
7.0 |
23.3 |
50,000 to 99,999 lbs |
35.1 |
2.4 |
41.1 |
3.8 |
18.0 |
0.7 |
S |
100,000 lbs or more |
38.4 |
4.8 |
32.7 |
2.7 |
35.0 |
7.3 |
16.7 |
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 |
16.2 |
– |
23.7 |
– |
12.6 |
– |
16.4 |
Less than 50 lbs |
35.9 |
0.7 |
29.5 |
– |
32.9 |
– |
22.9 |
50 to 99 lbs |
35.2 |
0.5 |
22.2 |
– |
22.3 |
– |
32.0 |
100 to 499 lbs |
25.2 |
2.1 |
22.5 |
0.2 |
13.6 |
0.3 |
29.3 |
500 to 749 lbs |
21.7 |
0.6 |
22.7 |
0.1 |
12.6 |
0.1 |
42.4 |
750 to 999 lbs |
39.4 |
1.8 |
21.5 |
0.2 |
15.3 |
0.2 |
36.4 |
1,000 to 9,999 lbs |
15.0 |
2.5 |
18.3 |
1.4 |
8.3 |
1.7 |
20.8 |
10,000 to 49,999 lbs |
22.0 |
6.0 |
24.3 |
5.1 |
14.6 |
2.9 |
23.8 |
50,000 to 99,999 lbs |
15.3 |
0.2 |
42.2 |
4.2 |
25.6 |
1.1 |
47.4 |
100,000 lbs or more |
S |
S |
40.8 |
2.0 |
S |
S |
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 |
40.4 |
– |
23.5 |
– |
24.0 |
– |
10.2 |
Less than 50 lbs |
S |
S |
S |
S |
S |
S |
31.6 |
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 |
31.6 |
10,000 to 49,999 lbs |
38.6 |
11.1 |
46.4 |
6.5 |
42.9 |
8.5 |
22.0 |
50,000 to 99,999 lbs |
42.9 |
7.9 |
42.1 |
3.3 |
42.4 |
3.6 |
25.9 |
100,000 lbs or more |
41.0 |
9.9 |
25.1 |
6.8 |
24.1 |
8.5 |
10.3 |
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 |
42.7 |
– |
S |
S |
S |
S |
7.6 |
Less than 50 lbs |
S |
S |
S |
S |
S |
S |
6.3 |
50 to 99 lbs |
49.6 |
1.8 |
43.6 |
4.2 |
41.3 |
4.8 |
17.5 |
100 to 499 lbs |
S |
S |
46.3 |
13.3 |
40.7 |
14.0 |
15.5 |
500 to 749 lbs |
S |
S |
S |
S |
S |
S |
31.6 |
750 to 999 lbs |
S |
S |
S |
S |
S |
S |
29.8 |
1,000 to 9,999 lbs |
S |
S |
S |
S |
S |
S |
28.3 |
10,000 to 49,999 lbs |
– |
– |
– |
– |
– |
– |
– |
50,000 to 99,999 lbs |
– |
– |
– |
– |
– |
– |
– |
100,000 lbs or more |
S |
S |
S |
S |
S |
S |
27.9 |
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 |
13.4 |
– |
33.2 |
– |
31.6 |
– |
11.7 |
Less than 50 lbs |
16.0 |
4.4 |
48.5 |
4.5 |
S |
S |
12.4 |
50 to 99 lbs |
22.3 |
1.9 |
31.5 |
2.7 |
23.7 |
3.9 |
10.7 |
100 to 499 lbs |
19.7 |
3.5 |
40.7 |
3.7 |
21.2 |
4.4 |
20.3 |
500 to 749 lbs |
S |
S |
S |
S |
S |
S |
26.7 |
750 to 999 lbs |
S |
S |
S |
S |
S |
S |
S |
1,000 to 9,999 lbs |
S |
S |
S |
S |
S |
S |
30.1 |
10,000 to 49,999 lbs |
S |
S |
S |
S |
S |
S |
29.3 |
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 |
13.4 |
– |
39.9 |
– |
38.6 |
– |
11.7 |
Less than 50 lbs |
16.0 |
4.4 |
48.5 |
3.8 |
S |
S |
12.4 |
50 to 99 lbs |
22.3 |
2.0 |
31.5 |
2.0 |
23.7 |
3.0 |
10.7 |
100 to 499 lbs |
19.7 |
3.5 |
40.8 |
3.2 |
21.2 |
5.4 |
20.3 |
500 to 749 lbs |
S |
S |
S |
S |
S |
S |
26.7 |
750 to 999 lbs |
S |
S |
S |
S |
S |
S |
26.9 |
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 |
38.1 |
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 |
S |
S |
S |
S |
S |
S |
30.2 |
1,000 to 9,999 lbs |
S |
S |
S |
S |
S |
S |
30.1 |
10,000 to 49,999 lbs |
S |
S |
S |
S |
S |
S |
29.3 |
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 |
24.8 |
– |
34.9 |
– |
41.3 |
– |
43.9 |
Less than 50 lbs |
S |
S |
46.5 |
2.5 |
S |
S |
S |
50 to 99 lbs |
44.9 |
1.5 |
38.5 |
0.6 |
S |
S |
S |
100 to 499 lbs |
S |
S |
41.3 |
3.5 |
S |
S |
S |
500 to 749 lbs |
S |
S |
S |
S |
S |
S |
30.1 |
750 to 999 lbs |
S |
S |
S |
S |
S |
S |
31.8 |
1,000 to 9,999 lbs |
38.9 |
7.6 |
41.9 |
9.5 |
40.4 |
13.3 |
S |
10,000 to 49,999 lbs |
37.5 |
8.8 |
43.0 |
12.4 |
48.5 |
14.1 |
21.7 |
50,000 to 99,999 lbs |
S |
S |
S |
S |
S |
S |
S |
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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