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 |
8.0 |
– |
22.3 |
– |
26.2 |
– |
10.7 |
Single modes |
9.2 |
2.1 |
22.2 |
0.4 |
26.7 |
3.8 |
26.7 |
Truck |
9.3 |
2.4 |
11.5 |
6.4 |
26.0 |
8.8 |
25.0 |
Rail |
38.5 |
0.4 |
S |
S |
S |
S |
17.5 |
All other Single modes |
23.0 |
0.8 |
S |
S |
S |
S |
9.4 |
Multiple modes |
11.6 |
1.7 |
30.6 |
0.4 |
47.5 |
3.4 |
7.6 |
Parcel, USPS or courier |
14.0 |
2.0 |
17.4 |
0.1 |
20.7 |
0.5 |
7.7 |
All other multiple modes |
40.9 |
0.4 |
S |
S |
S |
S |
23.3 |
Other and unknown modes |
31.4 |
0.8 |
S |
S |
S |
S |
23.9 |
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 |
46.0 |
– |
S |
Single modes |
S |
S |
S |
S |
48.7 |
4.0 |
S |
Truck |
S |
S |
S |
S |
S |
S |
27.9 |
Rail |
S |
S |
S |
S |
S |
S |
31.6 |
All other Single modes |
S |
S |
S |
S |
S |
S |
27.9 |
Multiple modes |
– |
– |
– |
– |
– |
– |
– |
Parcel, USPS or courier |
– |
– |
– |
– |
– |
– |
– |
All other multiple modes |
– |
– |
– |
– |
– |
– |
– |
Other and unknown modes |
S |
S |
S |
S |
S |
S |
S |
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 |
23.1 |
– |
21.5 |
– |
40.1 |
– |
S |
Single modes |
22.8 |
1.1 |
21.2 |
0.4 |
39.2 |
0.6 |
S |
Truck |
21.8 |
1.7 |
19.8 |
2.2 |
34.8 |
3.4 |
S |
Rail |
S |
S |
S |
S |
S |
S |
29.9 |
All other Single modes |
S |
S |
S |
S |
S |
S |
31.6 |
Multiple modes |
S |
S |
S |
S |
S |
S |
30.9 |
Parcel, USPS or courier |
S |
S |
S |
S |
S |
S |
30.9 |
All other multiple modes |
– |
– |
– |
– |
– |
– |
– |
Other and unknown modes |
S |
S |
S |
S |
S |
S |
S |
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 |
22.7 |
– |
26.9 |
– |
42.4 |
– |
17.6 |
Single modes |
18.0 |
2.7 |
26.9 |
– |
42.4 |
– |
18.7 |
Truck |
22.0 |
8.6 |
12.5 |
12.0 |
26.1 |
14.3 |
17.4 |
Rail |
46.5 |
0.8 |
47.0 |
0.4 |
S |
S |
26.5 |
All other Single modes |
S |
S |
S |
S |
S |
S |
S |
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 |
48.4 |
– |
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 |
18.7 |
– |
18.7 |
– |
32.2 |
– |
17.0 |
Single modes |
18.8 |
0.2 |
18.7 |
0.1 |
32.2 |
1.6 |
19.5 |
Truck |
16.9 |
2.5 |
18.4 |
0.8 |
26.7 |
7.5 |
19.2 |
Rail |
48.3 |
2.5 |
48.0 |
0.8 |
S |
S |
26.0 |
All other Single modes |
– |
– |
– |
– |
– |
– |
– |
Multiple modes |
S |
S |
S |
S |
S |
S |
31.8 |
Parcel, USPS or courier |
S |
S |
S |
S |
S |
S |
31.8 |
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 |
13.5 |
– |
S |
S |
S |
S |
17.4 |
Single modes |
15.8 |
3.8 |
S |
S |
S |
S |
24.2 |
Truck |
16.8 |
5.4 |
49.6 |
2.2 |
S |
S |
19.8 |
Rail |
39.9 |
0.7 |
S |
S |
S |
S |
23.3 |
All other Single modes |
32.0 |
3.3 |
40.3 |
0.2 |
41.4 |
1.1 |
7.2 |
Multiple modes |
36.4 |
3.4 |
S |
S |
S |
S |
15.2 |
Parcel, USPS or courier |
40.3 |
3.4 |
S |
S |
47.5 |
0.3 |
14.5 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
29.9 |
Other and unknown modes |
48.9 |
0.5 |
44.3 |
0.2 |
44.5 |
0.1 |
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 |
17.5 |
– |
18.6 |
– |
24.3 |
– |
5.0 |
Single modes |
24.2 |
8.4 |
19.4 |
3.1 |
25.0 |
5.2 |
11.1 |
Truck |
24.3 |
8.5 |
18.8 |
3.4 |
20.9 |
7.4 |
11.7 |
Rail |
S |
S |
S |
S |
S |
S |
28.4 |
All other Single modes |
S |
S |
S |
S |
S |
S |
20.0 |
Multiple modes |
32.7 |
8.0 |
35.5 |
2.6 |
34.1 |
5.1 |
4.6 |
Parcel, USPS or courier |
32.7 |
8.0 |
35.5 |
2.6 |
34.1 |
5.1 |
4.6 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
31.6 |
Other and unknown modes |
S |
S |
45.3 |
1.7 |
S |
S |
40.2 |
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 |
16.5 |
– |
17.1 |
– |
38.7 |
– |
30.4 |
Single modes |
16.6 |
3.8 |
17.4 |
1.3 |
40.3 |
2.5 |
37.6 |
Truck |
17.8 |
5.1 |
17.5 |
1.7 |
41.3 |
4.6 |
S |
Rail |
38.0 |
0.4 |
38.3 |
– |
40.8 |
1.0 |
24.2 |
All other Single modes |
S |
S |
S |
S |
S |
S |
16.5 |
Multiple modes |
28.0 |
3.7 |
45.8 |
0.7 |
S |
S |
17.0 |
Parcel, USPS or courier |
30.3 |
3.2 |
45.6 |
0.4 |
35.8 |
2.2 |
17.2 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
30.0 |
Other and unknown modes |
S |
S |
S |
S |
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 |
21.9 |
– |
23.1 |
– |
27.0 |
– |
12.2 |
Single modes |
22.4 |
8.9 |
31.5 |
8.9 |
34.9 |
7.9 |
23.2 |
Truck |
22.3 |
8.4 |
32.2 |
8.8 |
37.0 |
7.1 |
23.4 |
Rail |
46.2 |
0.2 |
44.6 |
0.5 |
44.6 |
2.1 |
25.8 |
All other Single modes |
38.5 |
1.1 |
S |
S |
S |
S |
16.8 |
Multiple modes |
35.3 |
8.5 |
36.9 |
7.0 |
38.4 |
7.7 |
7.9 |
Parcel, USPS or courier |
35.8 |
8.6 |
39.7 |
7.1 |
42.7 |
7.8 |
7.9 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
37.8 |
Other and unknown modes |
46.9 |
4.1 |
46.1 |
5.5 |
S |
S |
28.0 |
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 |
38.1 |
– |
38.2 |
– |
34.2 |
– |
17.3 |
Single modes |
41.9 |
4.4 |
41.0 |
4.5 |
39.0 |
10.3 |
27.5 |
Truck |
42.3 |
4.5 |
41.4 |
4.3 |
40.2 |
9.5 |
32.7 |
Rail |
S |
S |
S |
S |
S |
S |
30.0 |
All other Single modes |
S |
S |
S |
S |
S |
S |
20.2 |
Multiple modes |
35.4 |
2.5 |
S |
S |
S |
S |
12.9 |
Parcel, USPS or courier |
35.8 |
2.6 |
S |
S |
S |
S |
12.9 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
28.1 |
Other and unknown modes |
S |
S |
S |
S |
S |
S |
27.2 |
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 |
47.6 |
– |
S |
S |
42.8 |
– |
23.4 |
Single modes |
S |
S |
S |
S |
41.8 |
3.2 |
28.5 |
Truck |
48.7 |
19.6 |
S |
S |
49.7 |
9.8 |
S |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
S |
S |
S |
S |
S |
S |
31.6 |
Multiple modes |
S |
S |
S |
S |
S |
S |
30.6 |
Parcel, USPS or courier |
S |
S |
S |
S |
S |
S |
30.6 |
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.