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 |
5.9 |
– |
20.5 |
– |
19.3 |
– |
15.5 |
Single modes |
6.3 |
2.3 |
21.1 |
0.8 |
18.3 |
1.8 |
14.7 |
Truck |
5.8 |
2.2 |
22.6 |
2.8 |
17.8 |
3.5 |
11.9 |
Rail |
26.3 |
0.5 |
23.2 |
1.4 |
29.8 |
4.3 |
21.7 |
All other Single modes |
46.8 |
0.4 |
S |
S |
49.3 |
0.2 |
9.3 |
Multiple modes |
15.7 |
1.9 |
40.8 |
0.5 |
S |
S |
10.4 |
Parcel, USPS or courier |
17.0 |
1.9 |
17.6 |
0.1 |
21.7 |
0.5 |
10.4 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
23.0 |
Other and unknown modes |
29.1 |
1.1 |
17.5 |
0.5 |
34.7 |
1.5 |
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 |
48.1 |
– |
40.3 |
– |
S |
S |
43.9 |
Single modes |
48.1 |
0.2 |
40.3 |
0.5 |
S |
S |
43.9 |
Truck |
49.0 |
13.6 |
40.9 |
15.3 |
S |
S |
30.2 |
Rail |
S |
S |
S |
S |
S |
S |
28.4 |
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 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 |
35.7 |
– |
23.3 |
– |
38.9 |
– |
26.4 |
Single modes |
34.6 |
1.0 |
22.1 |
1.3 |
30.8 |
5.7 |
35.9 |
Truck |
34.6 |
2.1 |
19.6 |
5.7 |
23.9 |
12.1 |
37.4 |
Rail |
47.5 |
2.0 |
48.2 |
5.4 |
S |
S |
24.2 |
All other Single modes |
– |
– |
– |
– |
– |
– |
– |
Multiple modes |
S |
S |
S |
S |
S |
S |
27.6 |
Parcel, USPS or courier |
S |
S |
S |
S |
S |
S |
31.6 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
26.9 |
Other and unknown modes |
S |
S |
S |
S |
S |
S |
28.2 |
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 |
18.1 |
– |
30.1 |
– |
31.6 |
– |
32.0 |
Single modes |
18.1 |
0.3 |
30.2 |
– |
31.8 |
0.6 |
32.3 |
Truck |
18.1 |
0.3 |
30.2 |
– |
31.8 |
0.6 |
32.3 |
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 |
31.2 |
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 |
29.0 |
– |
38.6 |
– |
49.6 |
– |
36.2 |
Single modes |
29.0 |
0.4 |
38.6 |
– |
49.6 |
– |
38.0 |
Truck |
34.2 |
11.1 |
42.0 |
10.8 |
45.5 |
10.5 |
39.6 |
Rail |
S |
S |
S |
S |
S |
S |
31.6 |
All other Single modes |
S |
S |
S |
S |
S |
S |
26.0 |
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 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 |
36.4 |
– |
29.9 |
– |
49.2 |
– |
24.5 |
Single modes |
31.4 |
6.9 |
31.4 |
6.9 |
49.7 |
4.8 |
49.5 |
Truck |
29.3 |
8.0 |
34.3 |
7.9 |
36.7 |
9.8 |
49.2 |
Rail |
S |
S |
S |
S |
S |
S |
23.6 |
All other Single modes |
35.8 |
– |
S |
S |
S |
S |
25.7 |
Multiple modes |
S |
S |
48.6 |
5.2 |
40.0 |
4.5 |
18.5 |
Parcel, USPS or courier |
S |
S |
48.6 |
5.2 |
40.0 |
4.5 |
18.5 |
All other multiple modes |
– |
– |
– |
– |
– |
– |
– |
Other and unknown modes |
S |
S |
S |
S |
S |
S |
31.2 |
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 |
– |
33.7 |
– |
S |
S |
9.8 |
Single modes |
26.9 |
10.0 |
33.8 |
5.1 |
S |
S |
17.4 |
Truck |
26.9 |
10.0 |
33.8 |
5.1 |
S |
S |
17.4 |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
34.5 |
– |
S |
S |
43.4 |
– |
27.0 |
Multiple modes |
33.7 |
9.8 |
S |
S |
S |
S |
7.0 |
Parcel, USPS or courier |
35.3 |
10.0 |
40.3 |
5.5 |
44.7 |
11.0 |
7.0 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
29.7 |
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 |
29.1 |
– |
S |
S |
26.0 |
– |
12.7 |
Single modes |
31.2 |
3.4 |
S |
S |
28.8 |
4.4 |
29.9 |
Truck |
31.2 |
3.5 |
S |
S |
29.1 |
4.4 |
15.2 |
Rail |
S |
S |
S |
S |
S |
S |
33.2 |
All other Single modes |
S |
S |
48.7 |
– |
47.1 |
– |
9.9 |
Multiple modes |
44.8 |
3.0 |
S |
S |
S |
S |
8.5 |
Parcel, USPS or courier |
33.1 |
1.2 |
45.6 |
0.5 |
44.0 |
0.7 |
8.6 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
27.8 |
Other and unknown modes |
S |
S |
33.9 |
2.8 |
S |
S |
29.5 |
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 |
9.2 |
– |
14.3 |
– |
15.1 |
– |
26.4 |
Single modes |
8.2 |
4.9 |
16.3 |
4.5 |
16.4 |
4.0 |
S |
Truck |
8.5 |
5.3 |
16.4 |
7.7 |
11.7 |
9.5 |
S |
Rail |
36.4 |
2.5 |
41.6 |
8.5 |
42.9 |
9.8 |
27.4 |
All other Single modes |
S |
S |
S |
S |
S |
S |
12.5 |
Multiple modes |
27.0 |
3.6 |
S |
S |
41.4 |
2.3 |
22.1 |
Parcel, USPS or courier |
27.0 |
3.5 |
S |
S |
44.2 |
2.1 |
22.4 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
27.9 |
Other and unknown modes |
S |
S |
S |
S |
S |
S |
37.1 |
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 |
16.4 |
– |
19.0 |
– |
27.1 |
– |
27.5 |
Single modes |
17.2 |
2.8 |
18.5 |
0.4 |
27.4 |
1.4 |
43.2 |
Truck |
17.3 |
3.0 |
17.3 |
3.7 |
27.9 |
3.1 |
38.7 |
Rail |
37.9 |
0.2 |
48.0 |
3.7 |
36.1 |
3.4 |
37.5 |
All other Single modes |
S |
S |
S |
S |
S |
S |
31.5 |
Multiple modes |
27.9 |
2.7 |
42.8 |
0.3 |
34.2 |
1.0 |
21.6 |
Parcel, USPS or courier |
27.9 |
2.7 |
42.8 |
0.3 |
34.2 |
1.0 |
21.6 |
All other multiple modes |
– |
– |
– |
– |
– |
– |
– |
Other and unknown modes |
44.7 |
0.4 |
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 |
46.1 |
– |
38.2 |
– |
S |
S |
23.0 |
Single modes |
S |
S |
48.4 |
15.3 |
S |
S |
22.1 |
Truck |
S |
S |
S |
S |
S |
S |
22.4 |
Rail |
S |
S |
S |
S |
S |
S |
31.6 |
All other Single modes |
– |
– |
– |
– |
– |
– |
– |
Multiple modes |
S |
S |
S |
S |
S |
S |
23.3 |
Parcel, USPS or courier |
S |
S |
S |
S |
S |
S |
23.3 |
All other multiple modes |
– |
– |
– |
– |
– |
– |
– |
Other and unknown modes |
S |
S |
S |
S |
S |
S |
31.6 |
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.