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 |
13.0 |
– |
19.6 |
– |
20.6 |
– |
18.4 |
Single modes |
15.0 |
4.7 |
24.1 |
5.9 |
23.8 |
8.2 |
27.8 |
Truck |
15.6 |
4.8 |
24.6 |
6.8 |
27.3 |
9.1 |
29.2 |
Rail |
S |
S |
38.6 |
1.2 |
39.0 |
3.3 |
17.3 |
All other Single modes |
39.2 |
0.6 |
S |
S |
39.6 |
0.2 |
41.2 |
Multiple modes |
21.0 |
3.8 |
30.9 |
0.3 |
49.8 |
2.6 |
12.7 |
Parcel, USPS or courier |
22.3 |
3.7 |
22.6 |
0.2 |
26.5 |
1.0 |
12.7 |
All other multiple modes |
45.4 |
0.4 |
S |
S |
S |
S |
S |
Other and unknown modes |
38.1 |
4.3 |
39.0 |
5.9 |
S |
S |
23.4 |
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 |
41.6 |
– |
35.3 |
– |
49.7 |
– |
35.8 |
Single modes |
41.9 |
0.8 |
35.4 |
– |
49.7 |
– |
32.4 |
Truck |
43.4 |
5.8 |
28.8 |
6.0 |
S |
S |
33.4 |
Rail |
42.3 |
5.8 |
48.9 |
6.0 |
48.7 |
7.3 |
24.4 |
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 |
31.6 |
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 |
18.1 |
– |
21.8 |
– |
14.8 |
– |
S |
Single modes |
18.1 |
1.6 |
22.1 |
0.7 |
14.3 |
2.4 |
S |
Truck |
18.1 |
1.6 |
22.1 |
0.7 |
14.3 |
2.4 |
S |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
S |
S |
S |
S |
S |
S |
31.6 |
Multiple modes |
S |
S |
S |
S |
S |
S |
20.1 |
Parcel, USPS or courier |
S |
S |
45.5 |
– |
38.7 |
– |
20.1 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
31.6 |
Other and unknown modes |
S |
S |
S |
S |
S |
S |
39.8 |
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 |
19.8 |
– |
25.5 |
– |
24.7 |
– |
11.2 |
Single modes |
19.1 |
14.2 |
15.1 |
16.3 |
21.4 |
16.5 |
15.5 |
Truck |
19.1 |
14.2 |
15.1 |
16.3 |
21.4 |
16.5 |
15.5 |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
– |
– |
– |
– |
– |
– |
– |
Multiple modes |
– |
– |
– |
– |
– |
– |
– |
Parcel, USPS or courier |
– |
– |
– |
– |
– |
– |
– |
All other multiple modes |
– |
– |
– |
– |
– |
– |
– |
Other and unknown modes |
47.2 |
14.2 |
46.5 |
16.3 |
46.5 |
16.5 |
25.8 |
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 |
45.9 |
– |
40.5 |
– |
40.9 |
– |
18.5 |
Single modes |
45.9 |
– |
40.5 |
– |
40.9 |
– |
18.5 |
Truck |
S |
S |
S |
S |
S |
S |
27.5 |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
S |
S |
S |
S |
46.8 |
12.7 |
26.3 |
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 |
24.6 |
– |
41.1 |
– |
S |
S |
13.5 |
Single modes |
25.0 |
12.4 |
26.0 |
18.6 |
34.5 |
18.3 |
47.9 |
Truck |
26.1 |
12.2 |
26.0 |
18.6 |
34.5 |
18.3 |
48.1 |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
S |
S |
S |
S |
S |
S |
28.8 |
Multiple modes |
S |
S |
45.1 |
2.1 |
48.0 |
7.0 |
12.6 |
Parcel, USPS or courier |
S |
S |
S |
S |
S |
S |
12.6 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
48.4 |
Other and unknown modes |
S |
S |
S |
S |
S |
S |
26.5 |
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 |
25.0 |
– |
18.9 |
– |
30.4 |
– |
19.1 |
Single modes |
30.0 |
6.7 |
20.8 |
4.3 |
33.3 |
6.8 |
46.8 |
Truck |
30.1 |
6.7 |
20.8 |
4.2 |
33.3 |
6.8 |
46.7 |
Rail |
S |
S |
S |
S |
S |
S |
34.9 |
All other Single modes |
S |
S |
S |
S |
S |
S |
28.2 |
Multiple modes |
36.2 |
4.0 |
23.1 |
1.0 |
37.3 |
2.6 |
16.2 |
Parcel, USPS or courier |
36.9 |
4.0 |
26.0 |
1.0 |
39.8 |
2.8 |
16.3 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
28.2 |
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 |
24.3 |
– |
48.6 |
– |
49.1 |
– |
14.4 |
Single modes |
27.0 |
4.4 |
49.1 |
2.0 |
S |
S |
43.0 |
Truck |
27.7 |
4.5 |
49.3 |
2.3 |
S |
S |
42.5 |
Rail |
S |
S |
S |
S |
S |
S |
30.2 |
All other Single modes |
S |
S |
S |
S |
S |
S |
17.9 |
Multiple modes |
S |
S |
S |
S |
S |
S |
17.0 |
Parcel, USPS or courier |
S |
S |
S |
S |
S |
S |
16.5 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
30.7 |
Other and unknown modes |
42.6 |
1.0 |
42.8 |
0.4 |
S |
S |
25.8 |
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 |
35.3 |
– |
32.7 |
– |
30.7 |
– |
S |
Single modes |
41.9 |
7.7 |
34.8 |
7.6 |
31.6 |
2.7 |
S |
Truck |
42.3 |
7.7 |
35.6 |
7.4 |
33.8 |
4.0 |
S |
Rail |
44.7 |
0.2 |
44.7 |
1.1 |
43.9 |
3.0 |
26.1 |
All other Single modes |
S |
S |
41.3 |
– |
40.3 |
0.2 |
22.7 |
Multiple modes |
18.7 |
5.0 |
18.4 |
0.8 |
22.3 |
2.8 |
20.7 |
Parcel, USPS or courier |
19.0 |
4.8 |
18.5 |
0.7 |
23.2 |
2.3 |
20.5 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
S |
Other and unknown modes |
46.3 |
8.5 |
44.8 |
7.9 |
43.5 |
0.4 |
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 |
24.1 |
– |
36.9 |
– |
28.4 |
– |
21.6 |
Single modes |
27.4 |
5.3 |
37.9 |
3.0 |
30.6 |
5.2 |
S |
Truck |
27.5 |
5.4 |
37.9 |
3.0 |
30.6 |
5.2 |
S |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
S |
S |
S |
S |
S |
S |
23.3 |
Multiple modes |
37.0 |
5.3 |
44.3 |
3.0 |
S |
S |
14.8 |
Parcel, USPS or courier |
31.9 |
3.8 |
45.6 |
2.1 |
S |
S |
14.8 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
31.6 |
Other and unknown modes |
S |
S |
S |
S |
S |
S |
35.6 |
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 |
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 |
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.