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Table B–6. Estimated Measures of Reliability for Shipment Characteristics by Commodity Group and Mode of Transportation 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 Commodities
Mode of transportation |
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 modes |
10.1 |
– |
22.4 |
– |
12.8 |
– |
13.3 |
Single modes |
11.6 |
2.4 |
22.8 |
0.6 |
13.0 |
0.6 |
14.1 |
Truck |
16.2 |
6.4 |
23.7 |
3.1 |
12.6 |
7.6 |
16.4 |
Rail |
40.4 |
6.3 |
23.5 |
2.4 |
24.0 |
5.8 |
10.2 |
All other Single modes |
42.7 |
0.8 |
S |
S |
S |
S |
7.6 |
Multiple modes |
13.4 |
2.1 |
33.2 |
0.2 |
31.6 |
0.5 |
11.7 |
Parcel, USPS or courier |
13.4 |
2.1 |
39.9 |
0.2 |
38.6 |
0.5 |
11.7 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
38.1 |
Other and unknown modes |
24.8 |
0.7 |
34.9 |
0.6 |
41.3 |
0.6 |
43.9 |
SCTG 01-05, Agriculture products and fish
Mode of transportation |
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 modes |
30.7 |
– |
36.5 |
– |
37.2 |
– |
24.0 |
Single modes |
29.7 |
1.2 |
36.2 |
0.4 |
37.4 |
0.9 |
25.0 |
Truck |
31.9 |
11.4 |
39.4 |
11.8 |
35.3 |
15.3 |
27.6 |
Rail |
29.4 |
12.0 |
36.0 |
11.0 |
34.1 |
12.6 |
26.5 |
All other Single modes |
S |
S |
S |
S |
S |
S |
27.9 |
Multiple modes |
S |
S |
S |
S |
S |
S |
31.6 |
Parcel, USPS or courier |
S |
S |
S |
S |
S |
S |
31.6 |
All other multiple modes |
– |
– |
– |
– |
– |
– |
– |
Other and unknown modes |
S |
S |
S |
S |
S |
S |
30.1 |
SCTG 06-09, Grains, alcohol, and tobacco products
Mode of transportation |
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 modes |
23.4 |
– |
16.1 |
– |
30.7 |
– |
S |
Single modes |
23.8 |
1.7 |
16.6 |
1.8 |
30.9 |
0.5 |
S |
Truck |
23.5 |
2.0 |
16.1 |
1.9 |
29.5 |
2.8 |
S |
Rail |
S |
S |
S |
S |
S |
S |
26.9 |
All other Single modes |
S |
S |
S |
S |
S |
S |
29.9 |
Multiple modes |
S |
S |
S |
S |
S |
S |
36.8 |
Parcel, USPS or courier |
S |
S |
40.8 |
– |
40.3 |
– |
17.3 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
31.6 |
Other and unknown modes |
S |
S |
S |
S |
S |
S |
24.7 |
SCTG 10-14, Stones, non-metallic minerals, and metallic ores
Mode of transportation |
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 modes |
S |
S |
S |
S |
S |
S |
22.9 |
Single modes |
S |
S |
S |
S |
S |
S |
22.9 |
Truck |
S |
S |
S |
S |
S |
S |
22.9 |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
– |
– |
– |
– |
– |
– |
– |
Multiple modes |
– |
– |
– |
– |
– |
– |
– |
Parcel, USPS or courier |
– |
– |
– |
– |
– |
– |
– |
All other multiple modes |
– |
– |
– |
– |
– |
– |
– |
Other and unknown modes |
– |
– |
– |
– |
– |
– |
– |
SCTG 15-19, Coal and petroleum products
Mode of transportation |
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 modes |
S |
S |
41.4 |
– |
41.8 |
– |
25.6 |
Single modes |
S |
S |
41.4 |
– |
41.8 |
– |
26.1 |
Truck |
S |
S |
41.4 |
– |
41.8 |
– |
26.1 |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
– |
– |
– |
– |
– |
– |
– |
Multiple modes |
S |
S |
S |
S |
S |
S |
31.6 |
Parcel, USPS or courier |
S |
S |
S |
S |
S |
S |
31.6 |
All other multiple modes |
– |
– |
– |
– |
– |
– |
– |
Other and unknown modes |
– |
– |
– |
– |
– |
– |
– |
SCTG 20-24, Pharmaceutical and chemical products
Mode of transportation |
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 modes |
14.2 |
– |
13.7 |
– |
30.3 |
– |
14.8 |
Single modes |
11.9 |
5.5 |
14.1 |
1.2 |
30.8 |
1.7 |
17.3 |
Truck |
12.1 |
6.5 |
16.1 |
5.1 |
34.7 |
8.1 |
23.4 |
Rail |
47.0 |
3.5 |
44.8 |
5.1 |
45.9 |
7.8 |
22.5 |
All other Single modes |
S |
S |
S |
S |
S |
S |
27.9 |
Multiple modes |
48.1 |
5.4 |
34.4 |
1.1 |
46.7 |
1.7 |
13.7 |
Parcel, USPS or courier |
48.1 |
5.4 |
32.2 |
0.9 |
41.4 |
1.4 |
13.7 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
31.6 |
Other and unknown modes |
S |
S |
S |
S |
S |
S |
S |
SCTG 25-30, Logs, wood products, and textile and leather
Mode of transportation |
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 modes |
11.7 |
– |
10.4 |
– |
21.8 |
– |
12.4 |
Single modes |
15.6 |
5.6 |
13.5 |
6.5 |
23.4 |
5.7 |
46.6 |
Truck |
15.8 |
5.4 |
13.5 |
6.4 |
23.6 |
5.6 |
35.2 |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
46.7 |
0.6 |
40.1 |
– |
S |
S |
14.1 |
Multiple modes |
16.7 |
4.4 |
23.0 |
0.9 |
26.3 |
4.7 |
5.2 |
Parcel, USPS or courier |
16.7 |
4.4 |
23.0 |
0.9 |
26.3 |
4.7 |
5.2 |
All other multiple modes |
– |
– |
– |
– |
– |
– |
– |
Other and unknown modes |
40.8 |
1.9 |
S |
S |
S |
S |
S |
SCTG 31-34, Base metal and machinery
Mode of transportation |
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 modes |
16.6 |
– |
S |
S |
36.2 |
– |
39.3 |
Single modes |
18.8 |
5.5 |
S |
S |
35.1 |
0.9 |
S |
Truck |
18.9 |
5.4 |
S |
S |
34.3 |
1.3 |
S |
Rail |
S |
S |
S |
S |
S |
S |
31.6 |
All other Single modes |
S |
S |
36.7 |
– |
45.3 |
– |
17.8 |
Multiple modes |
S |
S |
S |
S |
S |
S |
26.7 |
Parcel, USPS or courier |
S |
S |
38.9 |
0.1 |
48.7 |
0.3 |
27.1 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
45.1 |
Other and unknown modes |
44.4 |
– |
S |
S |
S |
S |
S |
SCTG 35-38, Electronic, motorized vehicles, and precision instruments
Mode of transportation |
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 modes |
25.5 |
– |
45.2 |
– |
28.3 |
– |
14.3 |
Single modes |
31.8 |
11.6 |
46.5 |
5.7 |
27.5 |
2.7 |
14.8 |
Truck |
20.9 |
10.4 |
S |
S |
44.7 |
13.2 |
29.0 |
Rail |
42.4 |
14.5 |
39.0 |
11.0 |
38.3 |
12.9 |
21.4 |
All other Single modes |
S |
S |
S |
S |
S |
S |
16.0 |
Multiple modes |
30.5 |
10.3 |
S |
S |
46.6 |
1.4 |
23.4 |
Parcel, USPS or courier |
30.5 |
10.3 |
S |
S |
46.6 |
1.4 |
23.4 |
All other multiple modes |
– |
– |
– |
– |
– |
– |
– |
Other and unknown modes |
35.6 |
7.0 |
S |
S |
S |
S |
S |
SCTG 39-43, Furniture, mixed freight and misc manufactured products
Mode of transportation |
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 modes |
29.7 |
– |
25.8 |
– |
31.0 |
– |
23.6 |
Single modes |
32.3 |
4.7 |
26.2 |
1.0 |
32.5 |
3.1 |
14.8 |
Truck |
32.3 |
4.7 |
26.2 |
1.0 |
32.5 |
3.1 |
15.6 |
Rail |
S |
S |
S |
S |
S |
S |
31.6 |
All other Single modes |
S |
S |
S |
S |
S |
S |
31.6 |
Multiple modes |
41.4 |
4.7 |
S |
S |
S |
S |
20.9 |
Parcel, USPS or courier |
41.4 |
4.7 |
S |
S |
S |
S |
20.9 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
31.6 |
Other and unknown modes |
S |
S |
S |
S |
S |
S |
45.4 |
Commodity Unknown
Mode of transportation |
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 modes |
S |
S |
S |
S |
S |
S |
44.7 |
Single modes |
S |
S |
S |
S |
S |
S |
34.3 |
Truck |
S |
S |
S |
S |
S |
S |
S |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
S |
S |
S |
S |
S |
S |
30.1 |
Multiple modes |
S |
S |
S |
S |
S |
S |
S |
Parcel, USPS or courier |
S |
S |
S |
S |
S |
S |
S |
All other multiple modes |
– |
– |
– |
– |
– |
– |
– |
Other and unknown modes |
– |
– |
– |
– |
– |
– |
– |
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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