Table B-6. Estimated Measures of Reliability for Shipment Characteristics by Commodity Group and Mode of Transportation for CBSA of Origin: 2002
Monday, July 2, 2012
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]
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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 |
7.7 |
– |
15.5 |
– |
22.6 |
– |
15.4 |
Single modes |
9.7 |
2.7 |
16.1 |
2.5 |
24.7 |
3.3 |
21.0 |
Truck |
9.4 |
2.4 |
19.9 |
5.0 |
11.4 |
4.2 |
31.5 |
Rail |
21.9 |
2.0 |
27.3 |
5.1 |
33.1 |
6.3 |
8.1 |
All other Single modes |
31.8 |
0.4 |
36.6 |
0.4 |
29.7 |
0.3 |
9.3 |
Multiple modes |
17.8 |
2.8 |
30.2 |
0.6 |
34.8 |
3.4 |
9.2 |
Parcel, USPS or courier |
19.1 |
2.5 |
39.9 |
– |
S |
S |
9.4 |
All other multiple modes |
29.0 |
0.5 |
33.1 |
0.6 |
38.4 |
3.3 |
45.5 |
Other and unknown modes |
24.8 |
0.9 |
46.9 |
2.7 |
36.7 |
0.6 |
S |
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 |
25.0 |
– |
21.0 |
– |
29.2 |
– |
18.9 |
Single modes |
24.2 |
8.4 |
18.6 |
5.2 |
34.2 |
8.4 |
S |
Truck |
30.1 |
10.1 |
21.6 |
8.8 |
35.1 |
9.7 |
S |
Rail |
S |
S |
S |
S |
S |
S |
25.2 |
All other Single modes |
S |
S |
38.1 |
7.6 |
37.8 |
9.6 |
29.6 |
Multiple modes |
S |
S |
46.0 |
4.2 |
S |
S |
19.4 |
Parcel, USPS or courier |
S |
S |
S |
S |
S |
S |
19.9 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
29.4 |
Other and unknown modes |
S |
S |
S |
S |
S |
S |
S |
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 |
20.0 |
– |
21.6 |
– |
33.7 |
– |
39.9 |
Single modes |
20.9 |
2.1 |
22.6 |
5.0 |
34.0 |
0.6 |
S |
Truck |
20.7 |
2.1 |
23.4 |
5.2 |
40.1 |
10.0 |
S |
Rail |
25.8 |
1.7 |
27.5 |
2.3 |
22.9 |
10.5 |
12.1 |
All other Single modes |
S |
S |
S |
S |
S |
S |
30.3 |
Multiple modes |
S |
S |
S |
S |
S |
S |
22.5 |
Parcel, USPS or courier |
S |
S |
S |
S |
S |
S |
22.5 |
All other multiple modes |
– |
– |
– |
– |
– |
– |
– |
Other and unknown modes |
S |
S |
S |
S |
S |
S |
32.2 |
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 |
28.0 |
– |
27.4 |
– |
S |
S |
S |
Single modes |
24.7 |
3.8 |
28.3 |
2.5 |
S |
S |
S |
Truck |
26.6 |
3.5 |
30.4 |
4.3 |
S |
S |
S |
Rail |
42.7 |
2.9 |
41.1 |
4.2 |
46.8 |
7.3 |
28.1 |
All other Single modes |
– |
– |
– |
– |
– |
– |
– |
Multiple modes |
S |
S |
S |
S |
S |
S |
31.0 |
Parcel, USPS or courier |
S |
S |
S |
S |
S |
S |
31.6 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
38.1 |
Other and unknown modes |
S |
S |
S |
S |
S |
S |
31.3 |
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 |
47.6 |
– |
33.8 |
– |
45.2 |
– |
46.6 |
Single modes |
48.1 |
0.9 |
33.8 |
0.2 |
45.2 |
0.2 |
45.0 |
Truck |
48.1 |
0.9 |
33.8 |
0.2 |
45.2 |
0.2 |
45.0 |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
– |
– |
– |
– |
– |
– |
– |
Multiple modes |
– |
– |
– |
– |
– |
– |
– |
Parcel, USPS or courier |
– |
– |
– |
– |
– |
– |
– |
All other multiple modes |
– |
– |
– |
– |
– |
– |
– |
Other and unknown modes |
S |
S |
S |
S |
S |
S |
28.2 |
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 |
19.6 |
– |
22.5 |
– |
29.2 |
– |
S |
Single modes |
19.5 |
3.1 |
23.4 |
1.6 |
26.9 |
3.3 |
S |
Truck |
19.5 |
3.2 |
23.3 |
1.6 |
27.0 |
3.3 |
S |
Rail |
S |
S |
S |
S |
S |
S |
34.2 |
All other Single modes |
S |
S |
S |
S |
S |
S |
31.6 |
Multiple modes |
S |
S |
S |
S |
S |
S |
19.3 |
Parcel, USPS or courier |
S |
S |
49.4 |
– |
S |
S |
19.8 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
23.7 |
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 |
11.3 |
– |
17.5 |
– |
27.4 |
– |
19.4 |
Single modes |
13.6 |
2.7 |
21.8 |
6.1 |
30.3 |
5.1 |
22.6 |
Truck |
14.9 |
5.4 |
13.7 |
5.7 |
16.3 |
4.0 |
34.1 |
Rail |
22.8 |
5.4 |
30.9 |
6.0 |
34.4 |
7.1 |
8.8 |
All other Single modes |
S |
S |
S |
S |
S |
S |
21.8 |
Multiple modes |
24.7 |
1.8 |
38.0 |
1.7 |
45.9 |
5.2 |
15.6 |
Parcel, USPS or courier |
33.3 |
1.3 |
38.5 |
– |
28.5 |
– |
18.0 |
All other multiple modes |
35.4 |
1.3 |
38.8 |
1.7 |
46.3 |
5.2 |
S |
Other and unknown modes |
39.3 |
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 |
14.3 |
– |
S |
S |
33.3 |
– |
46.7 |
Single modes |
14.3 |
4.6 |
S |
S |
35.6 |
5.6 |
S |
Truck |
14.7 |
4.1 |
S |
S |
35.8 |
6.4 |
S |
Rail |
44.5 |
0.7 |
S |
S |
S |
S |
25.8 |
All other Single modes |
S |
S |
S |
S |
49.8 |
– |
9.8 |
Multiple modes |
44.4 |
4.4 |
34.2 |
0.7 |
45.5 |
5.5 |
14.6 |
Parcel, USPS or courier |
45.9 |
4.6 |
41.4 |
0.3 |
S |
S |
14.9 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
28.0 |
Other and unknown modes |
S |
S |
S |
S |
42.8 |
0.4 |
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 |
19.3 |
– |
21.7 |
– |
31.0 |
– |
15.8 |
Single modes |
24.2 |
6.8 |
26.7 |
8.7 |
40.3 |
11.2 |
25.4 |
Truck |
23.1 |
6.5 |
26.7 |
8.7 |
40.4 |
11.1 |
23.6 |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
S |
S |
S |
S |
S |
S |
26.5 |
Multiple modes |
33.9 |
7.5 |
44.8 |
4.8 |
47.3 |
6.4 |
11.4 |
Parcel, USPS or courier |
33.9 |
7.5 |
45.7 |
4.8 |
48.9 |
6.4 |
11.4 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
31.6 |
Other and unknown modes |
31.5 |
6.2 |
34.6 |
9.3 |
S |
S |
35.3 |
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 |
14.5 |
– |
18.8 |
– |
12.7 |
– |
13.8 |
Single modes |
19.0 |
8.8 |
19.6 |
2.2 |
15.3 |
4.6 |
18.0 |
Truck |
19.0 |
8.8 |
19.6 |
2.2 |
15.3 |
4.6 |
17.7 |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
S |
S |
S |
S |
S |
S |
28.1 |
Multiple modes |
34.9 |
8.8 |
30.6 |
1.9 |
33.4 |
4.6 |
10.5 |
Parcel, USPS or courier |
34.8 |
8.7 |
30.9 |
1.4 |
34.6 |
3.5 |
10.5 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
28.6 |
Other and unknown modes |
S |
S |
S |
S |
S |
S |
37.9 |
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 |
S |
Single modes |
S |
S |
46.3 |
8.7 |
S |
S |
S |
Truck |
S |
S |
34.3 |
17.9 |
S |
S |
S |
Rail |
S |
S |
S |
S |
S |
S |
31.6 |
All other Single modes |
– |
– |
– |
– |
– |
– |
– |
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 |
S |
S |
S |
S |
S |
S |
31.7 |
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.