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 |
10.0 |
– |
33.4 |
– |
19.7 |
– |
37.7 |
Single modes |
10.8 |
3.2 |
33.7 |
1.0 |
21.9 |
5.7 |
19.0 |
Truck |
11.1 |
3.7 |
33.8 |
1.5 |
22.1 |
6.1 |
22.5 |
Rail |
S |
S |
S |
S |
S |
S |
26.9 |
All other Single modes |
45.2 |
0.6 |
S |
S |
S |
S |
19.6 |
Multiple modes |
24.3 |
2.7 |
41.5 |
0.8 |
S |
S |
15.3 |
Parcel, USPS or courier |
26.5 |
2.4 |
40.0 |
0.2 |
31.3 |
0.3 |
15.2 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
25.0 |
Other and unknown modes |
S |
S |
45.2 |
0.4 |
31.1 |
0.2 |
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 |
S |
S |
S |
S |
S |
S |
32.5 |
Single modes |
S |
S |
S |
S |
S |
S |
32.5 |
Truck |
S |
S |
S |
S |
S |
S |
31.1 |
Rail |
S |
S |
S |
S |
S |
S |
29.8 |
All other Single modes |
– |
– |
– |
– |
– |
– |
– |
Multiple modes |
– |
– |
– |
– |
– |
– |
– |
Parcel, USPS or courier |
– |
– |
– |
– |
– |
– |
– |
All other multiple modes |
– |
– |
– |
– |
– |
– |
– |
Other and unknown modes |
– |
– |
– |
– |
– |
– |
– |
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 |
S |
S |
S |
S |
S |
S |
30.1 |
Single modes |
S |
S |
S |
S |
S |
S |
30.1 |
Truck |
S |
S |
S |
S |
S |
S |
30.3 |
Rail |
S |
S |
47.2 |
2.2 |
S |
S |
27.4 |
All other Single modes |
– |
– |
– |
– |
– |
– |
– |
Multiple modes |
– |
– |
– |
– |
– |
– |
– |
Parcel, USPS or courier |
– |
– |
– |
– |
– |
– |
– |
All other multiple modes |
– |
– |
– |
– |
– |
– |
– |
Other and unknown modes |
– |
– |
– |
– |
– |
– |
– |
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 |
S |
Single modes |
S |
S |
S |
S |
S |
S |
24.9 |
Truck |
S |
S |
S |
S |
S |
S |
24.9 |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
– |
– |
– |
– |
– |
– |
– |
Multiple modes |
S |
S |
S |
S |
S |
S |
31.5 |
Parcel, USPS or courier |
S |
S |
S |
S |
S |
S |
31.5 |
All other multiple modes |
– |
– |
– |
– |
– |
– |
– |
Other and unknown modes |
S |
S |
S |
S |
S |
S |
31.6 |
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 |
S |
S |
S |
S |
13.5 |
Single modes |
S |
S |
S |
S |
S |
S |
10.7 |
Truck |
S |
S |
S |
S |
S |
S |
10.7 |
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 |
31.6 |
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 |
37.0 |
– |
S |
S |
S |
S |
S |
Single modes |
40.0 |
11.7 |
S |
S |
S |
S |
S |
Truck |
40.0 |
12.4 |
S |
S |
S |
S |
S |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
S |
S |
S |
S |
S |
S |
28.8 |
Multiple modes |
S |
S |
S |
S |
S |
S |
38.3 |
Parcel, USPS or courier |
S |
S |
S |
S |
S |
S |
38.3 |
All other multiple modes |
– |
– |
– |
– |
– |
– |
– |
Other and unknown modes |
S |
S |
S |
S |
40.1 |
11.9 |
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 |
16.3 |
– |
22.9 |
– |
27.5 |
– |
22.5 |
Single modes |
17.3 |
8.7 |
23.9 |
2.7 |
27.3 |
1.8 |
40.2 |
Truck |
17.5 |
9.0 |
24.0 |
2.9 |
26.9 |
2.2 |
46.8 |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
S |
S |
S |
S |
S |
S |
30.2 |
Multiple modes |
S |
S |
S |
S |
S |
S |
23.7 |
Parcel, USPS or courier |
S |
S |
S |
S |
S |
S |
23.7 |
All other multiple modes |
– |
– |
– |
– |
– |
– |
– |
Other and unknown modes |
S |
S |
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 |
21.3 |
– |
23.4 |
– |
32.5 |
– |
S |
Single modes |
26.1 |
8.2 |
24.2 |
8.2 |
33.3 |
7.5 |
31.3 |
Truck |
26.1 |
8.3 |
24.2 |
8.2 |
33.2 |
7.4 |
33.4 |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
S |
S |
S |
S |
S |
S |
28.0 |
Multiple modes |
45.4 |
4.7 |
31.9 |
1.1 |
40.9 |
1.5 |
29.3 |
Parcel, USPS or courier |
45.4 |
4.7 |
32.4 |
1.1 |
27.8 |
1.5 |
29.1 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
31.6 |
Other and unknown modes |
S |
S |
42.7 |
7.1 |
39.6 |
6.1 |
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 |
24.4 |
– |
27.8 |
– |
38.6 |
– |
S |
Single modes |
33.8 |
7.7 |
35.0 |
7.9 |
36.6 |
14.8 |
S |
Truck |
36.0 |
8.6 |
35.1 |
8.0 |
37.3 |
14.0 |
S |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
S |
S |
S |
S |
S |
S |
24.6 |
Multiple modes |
31.1 |
7.3 |
S |
S |
S |
S |
34.5 |
Parcel, USPS or courier |
34.5 |
7.0 |
24.9 |
0.9 |
33.2 |
1.4 |
19.2 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
24.0 |
Other and unknown modes |
S |
S |
S |
S |
42.0 |
0.8 |
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 |
11.6 |
– |
14.1 |
– |
21.3 |
– |
24.3 |
Single modes |
11.9 |
2.1 |
14.1 |
0.2 |
21.5 |
0.5 |
22.4 |
Truck |
12.0 |
2.2 |
14.1 |
0.2 |
21.5 |
0.5 |
23.2 |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
S |
S |
45.4 |
– |
46.7 |
– |
26.1 |
Multiple modes |
S |
S |
39.2 |
0.2 |
42.1 |
0.5 |
19.4 |
Parcel, USPS or courier |
S |
S |
39.4 |
0.2 |
44.0 |
0.5 |
19.4 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
31.6 |
Other and unknown modes |
46.9 |
1.4 |
S |
S |
S |
S |
S |
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 |
S |
S |
S |
S |
S |
Truck |
S |
S |
S |
S |
S |
S |
S |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
– |
– |
– |
– |
– |
– |
– |
Multiple modes |
– |
– |
– |
– |
– |
– |
– |
Parcel, USPS or courier |
– |
– |
– |
– |
– |
– |
– |
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.