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 |
12.4 |
– |
37.5 |
– |
28.8 |
– |
11.9 |
Single modes |
13.3 |
1.7 |
37.7 |
1.9 |
31.0 |
4.2 |
15.4 |
Truck |
13.5 |
6.6 |
40.2 |
4.0 |
14.2 |
10.6 |
13.7 |
Rail |
49.8 |
7.2 |
S |
S |
S |
S |
16.4 |
All other Single modes |
22.3 |
0.2 |
24.5 |
– |
26.6 |
0.1 |
6.4 |
Multiple modes |
14.7 |
1.4 |
23.4 |
0.3 |
21.3 |
0.6 |
9.1 |
Parcel, USPS or courier |
15.4 |
1.4 |
27.2 |
0.4 |
25.9 |
0.5 |
9.2 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
30.4 |
Other and unknown modes |
33.8 |
0.5 |
S |
S |
S |
S |
27.4 |
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 |
45.2 |
– |
47.8 |
– |
S |
S |
S |
Single modes |
45.4 |
0.3 |
47.8 |
0.1 |
S |
S |
S |
Truck |
36.0 |
5.7 |
44.4 |
6.2 |
34.5 |
11.3 |
S |
Rail |
S |
S |
S |
S |
S |
S |
31.6 |
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 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 |
43.2 |
– |
S |
S |
S |
S |
31.0 |
Single modes |
45.7 |
3.9 |
S |
S |
S |
S |
S |
Truck |
45.9 |
3.8 |
S |
S |
S |
S |
S |
Rail |
S |
S |
S |
S |
S |
S |
31.6 |
All other Single modes |
– |
– |
– |
– |
– |
– |
– |
Multiple modes |
S |
S |
S |
S |
S |
S |
29.4 |
Parcel, USPS or courier |
S |
S |
S |
S |
S |
S |
29.4 |
All other multiple modes |
– |
– |
– |
– |
– |
– |
– |
Other and unknown modes |
S |
S |
S |
S |
S |
S |
31.4 |
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 |
40.8 |
– |
S |
S |
36.1 |
– |
S |
Single modes |
39.2 |
2.1 |
44.6 |
3.9 |
34.6 |
1.2 |
S |
Truck |
39.2 |
2.1 |
44.6 |
3.9 |
34.6 |
1.2 |
S |
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 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 |
29.3 |
Single modes |
S |
S |
S |
S |
S |
S |
29.3 |
Truck |
S |
S |
S |
S |
S |
S |
29.3 |
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 |
30.1 |
– |
24.2 |
– |
29.1 |
– |
20.5 |
Single modes |
30.9 |
2.0 |
24.4 |
0.9 |
29.7 |
1.8 |
S |
Truck |
32.4 |
4.8 |
34.2 |
10.0 |
40.9 |
9.7 |
S |
Rail |
41.7 |
4.0 |
41.6 |
9.9 |
41.9 |
9.5 |
26.1 |
All other Single modes |
S |
S |
S |
S |
S |
S |
21.6 |
Multiple modes |
39.0 |
2.0 |
S |
S |
S |
S |
8.1 |
Parcel, USPS or courier |
45.7 |
1.6 |
46.2 |
0.5 |
34.3 |
1.1 |
6.7 |
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 |
17.8 |
– |
30.7 |
– |
30.6 |
– |
18.0 |
Single modes |
19.7 |
9.7 |
31.0 |
5.4 |
32.6 |
11.6 |
30.2 |
Truck |
19.7 |
9.8 |
31.0 |
5.4 |
32.6 |
11.6 |
20.0 |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
S |
S |
S |
S |
S |
S |
41.2 |
Multiple modes |
31.2 |
9.3 |
S |
S |
45.5 |
11.7 |
9.9 |
Parcel, USPS or courier |
31.2 |
9.3 |
S |
S |
45.5 |
11.7 |
9.9 |
All other multiple modes |
– |
– |
– |
– |
– |
– |
– |
Other and unknown modes |
S |
S |
S |
S |
S |
S |
28.6 |
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 |
16.3 |
– |
S |
S |
29.0 |
– |
20.4 |
Single modes |
19.0 |
5.9 |
S |
S |
19.4 |
11.6 |
S |
Truck |
18.9 |
5.6 |
S |
S |
19.6 |
11.2 |
S |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
36.3 |
1.4 |
35.3 |
0.5 |
35.3 |
0.9 |
18.0 |
Multiple modes |
33.3 |
5.1 |
37.8 |
1.2 |
39.6 |
2.3 |
12.5 |
Parcel, USPS or courier |
34.1 |
5.2 |
38.4 |
1.2 |
42.5 |
2.2 |
12.7 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
31.6 |
Other and unknown modes |
42.6 |
1.0 |
S |
S |
S |
S |
45.0 |
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 |
28.3 |
– |
47.2 |
– |
S |
S |
23.6 |
Single modes |
30.1 |
3.5 |
47.6 |
0.7 |
S |
S |
S |
Truck |
32.9 |
12.9 |
37.3 |
16.1 |
S |
S |
48.8 |
Rail |
S |
S |
S |
S |
S |
S |
23.1 |
All other Single modes |
S |
S |
S |
S |
S |
S |
19.3 |
Multiple modes |
29.1 |
3.4 |
27.5 |
0.6 |
34.9 |
0.6 |
13.5 |
Parcel, USPS or courier |
29.1 |
3.4 |
27.5 |
0.6 |
34.9 |
0.6 |
13.5 |
All other multiple modes |
– |
– |
– |
– |
– |
– |
– |
Other and unknown modes |
S |
S |
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 |
11.6 |
– |
15.7 |
– |
19.6 |
– |
16.2 |
Single modes |
11.5 |
5.2 |
16.4 |
2.3 |
20.9 |
3.4 |
36.9 |
Truck |
11.4 |
5.2 |
16.4 |
2.3 |
21.0 |
3.4 |
41.8 |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
S |
S |
S |
S |
S |
S |
27.4 |
Multiple modes |
33.5 |
5.2 |
40.0 |
2.3 |
45.7 |
3.4 |
13.5 |
Parcel, USPS or courier |
33.5 |
5.2 |
41.1 |
2.3 |
45.7 |
3.4 |
13.5 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
31.6 |
Other and unknown modes |
47.9 |
0.2 |
34.9 |
– |
41.8 |
– |
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 |
35.9 |
– |
S |
S |
S |
S |
27.1 |
Single modes |
48.8 |
11.5 |
S |
S |
S |
S |
S |
Truck |
S |
S |
S |
S |
S |
S |
S |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
S |
S |
S |
S |
S |
S |
31.6 |
Multiple modes |
S |
S |
S |
S |
S |
S |
28.9 |
Parcel, USPS or courier |
S |
S |
S |
S |
S |
S |
28.9 |
All other multiple modes |
– |
– |
– |
– |
– |
– |
– |
Other and unknown modes |
S |
S |
S |
S |
S |
S |
S |
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.