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 |
9.9 |
– |
22.5 |
– |
14.9 |
– |
8.3 |
Single modes |
10.6 |
4.0 |
22.9 |
0.5 |
15.5 |
2.3 |
19.2 |
Truck |
11.3 |
4.2 |
23.1 |
0.8 |
15.5 |
2.5 |
20.8 |
Rail |
S |
S |
S |
S |
S |
S |
25.8 |
All other Single modes |
S |
S |
S |
S |
41.7 |
– |
13.7 |
Multiple modes |
27.5 |
4.0 |
34.1 |
0.3 |
42.7 |
2.1 |
5.8 |
Parcel, USPS or courier |
27.7 |
3.6 |
11.4 |
– |
12.9 |
0.2 |
5.9 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
26.1 |
Other and unknown modes |
28.6 |
1.0 |
32.0 |
0.4 |
40.7 |
0.3 |
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 |
31.0 |
Single modes |
S |
S |
S |
S |
S |
S |
31.0 |
Truck |
S |
S |
S |
S |
S |
S |
31.0 |
Rail |
– |
– |
– |
– |
– |
– |
– |
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 |
24.3 |
– |
14.8 |
– |
19.8 |
– |
S |
Single modes |
21.9 |
1.3 |
14.8 |
1.1 |
20.0 |
1.0 |
S |
Truck |
21.5 |
1.8 |
14.7 |
1.5 |
17.7 |
2.8 |
S |
Rail |
S |
S |
S |
S |
S |
S |
30.2 |
All other Single modes |
S |
S |
S |
S |
S |
S |
31.6 |
Multiple modes |
S |
S |
S |
S |
S |
S |
32.1 |
Parcel, USPS or courier |
S |
S |
S |
S |
S |
S |
32.1 |
All other multiple modes |
– |
– |
– |
– |
– |
– |
– |
Other and unknown modes |
S |
S |
S |
S |
S |
S |
44.4 |
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 |
30.6 |
– |
8.6 |
– |
22.1 |
– |
23.1 |
Single modes |
30.7 |
0.2 |
8.6 |
0.6 |
22.2 |
0.5 |
23.2 |
Truck |
30.7 |
0.2 |
8.6 |
0.6 |
22.2 |
0.5 |
23.2 |
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 |
S |
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 |
28.5 |
– |
33.3 |
– |
37.4 |
– |
11.9 |
Single modes |
28.5 |
– |
33.3 |
– |
37.4 |
– |
11.9 |
Truck |
28.5 |
– |
33.3 |
– |
37.4 |
– |
11.9 |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
– |
– |
– |
– |
– |
– |
– |
Multiple modes |
– |
– |
– |
– |
– |
– |
– |
Parcel, USPS or courier |
– |
– |
– |
– |
– |
– |
– |
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 |
20.9 |
– |
34.2 |
– |
28.6 |
– |
17.8 |
Single modes |
30.8 |
11.0 |
34.1 |
0.6 |
29.7 |
3.2 |
23.8 |
Truck |
20.6 |
11.0 |
31.8 |
5.6 |
31.8 |
5.6 |
20.4 |
Rail |
S |
S |
S |
S |
S |
S |
29.8 |
All other Single modes |
S |
S |
S |
S |
S |
S |
29.4 |
Multiple modes |
49.5 |
11.0 |
32.2 |
0.8 |
45.1 |
3.2 |
19.7 |
Parcel, USPS or courier |
S |
S |
38.4 |
0.7 |
S |
S |
16.7 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
27.9 |
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 |
14.1 |
– |
46.4 |
– |
24.4 |
– |
9.4 |
Single modes |
13.9 |
4.2 |
47.1 |
1.1 |
24.5 |
2.9 |
17.9 |
Truck |
13.9 |
4.3 |
47.3 |
1.5 |
24.5 |
2.9 |
21.5 |
Rail |
S |
S |
S |
S |
S |
S |
30.4 |
All other Single modes |
S |
S |
S |
S |
S |
S |
28.7 |
Multiple modes |
29.2 |
3.6 |
29.8 |
1.1 |
33.1 |
2.6 |
6.6 |
Parcel, USPS or courier |
29.2 |
3.6 |
31.2 |
1.0 |
33.6 |
2.6 |
6.6 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
29.9 |
Other and unknown modes |
47.5 |
0.8 |
41.6 |
0.2 |
40.5 |
0.4 |
24.9 |
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 |
19.8 |
– |
S |
S |
19.7 |
– |
16.0 |
Single modes |
20.6 |
2.6 |
S |
S |
20.0 |
0.6 |
S |
Truck |
20.8 |
2.8 |
S |
S |
20.0 |
0.6 |
S |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
S |
S |
S |
S |
S |
S |
20.7 |
Multiple modes |
32.1 |
2.3 |
27.7 |
0.2 |
41.4 |
0.4 |
10.1 |
Parcel, USPS or courier |
32.1 |
2.3 |
27.7 |
0.2 |
41.4 |
0.4 |
10.1 |
All other multiple modes |
– |
– |
– |
– |
– |
– |
– |
Other and unknown modes |
S |
S |
46.9 |
0.6 |
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 |
26.0 |
– |
36.9 |
– |
40.2 |
– |
12.6 |
Single modes |
30.9 |
7.8 |
41.2 |
5.4 |
47.5 |
7.3 |
25.0 |
Truck |
31.5 |
8.1 |
41.7 |
6.2 |
48.4 |
8.1 |
25.4 |
Rail |
S |
S |
S |
S |
S |
S |
29.9 |
All other Single modes |
S |
S |
S |
S |
S |
S |
24.2 |
Multiple modes |
48.6 |
7.2 |
S |
S |
S |
S |
10.1 |
Parcel, USPS or courier |
48.6 |
5.8 |
33.2 |
1.1 |
36.6 |
2.5 |
10.1 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
30.5 |
Other and unknown modes |
38.2 |
3.5 |
31.4 |
3.4 |
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 |
14.9 |
– |
14.0 |
– |
13.3 |
– |
14.2 |
Single modes |
14.3 |
1.8 |
14.1 |
0.8 |
13.4 |
0.7 |
33.1 |
Truck |
14.3 |
1.8 |
14.1 |
0.8 |
13.4 |
0.7 |
32.8 |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
49.6 |
– |
S |
S |
S |
S |
25.1 |
Multiple modes |
28.4 |
1.5 |
28.7 |
0.1 |
30.6 |
0.7 |
10.8 |
Parcel, USPS or courier |
28.4 |
1.5 |
28.7 |
0.1 |
30.6 |
0.7 |
10.8 |
All other multiple modes |
– |
– |
– |
– |
– |
– |
– |
Other and unknown modes |
S |
S |
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 |
42.7 |
– |
46.3 |
– |
S |
S |
24.2 |
Single modes |
44.8 |
16.1 |
46.4 |
17.9 |
S |
S |
27.2 |
Truck |
48.0 |
15.3 |
48.4 |
17.0 |
S |
S |
26.9 |
Rail |
S |
S |
S |
S |
S |
S |
31.6 |
All other Single modes |
– |
– |
– |
– |
– |
– |
– |
Multiple modes |
S |
S |
44.9 |
17.9 |
S |
S |
27.5 |
Parcel, USPS or courier |
S |
S |
44.9 |
17.9 |
S |
S |
27.5 |
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.