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 |
27.8 |
– |
34.4 |
– |
16.7 |
– |
9.7 |
Single modes |
30.4 |
2.0 |
35.3 |
0.8 |
17.1 |
1.6 |
15.8 |
Truck |
31.0 |
2.1 |
37.5 |
2.8 |
20.3 |
5.4 |
16.2 |
Rail |
41.4 |
0.9 |
36.5 |
2.5 |
42.2 |
5.4 |
8.3 |
All other Single modes |
30.3 |
0.1 |
S |
S |
S |
S |
19.5 |
Multiple modes |
21.1 |
1.8 |
40.2 |
0.5 |
38.3 |
1.5 |
8.4 |
Parcel, USPS or courier |
22.1 |
1.8 |
21.4 |
– |
30.0 |
0.4 |
8.5 |
All other multiple modes |
36.9 |
– |
S |
S |
47.5 |
1.1 |
S |
Other and unknown modes |
33.8 |
0.9 |
35.6 |
0.6 |
36.8 |
1.2 |
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 |
48.0 |
– |
35.5 |
– |
S |
S |
21.3 |
Single modes |
48.0 |
– |
35.5 |
– |
S |
S |
21.4 |
Truck |
48.0 |
– |
35.5 |
– |
S |
S |
21.4 |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
S |
S |
S |
S |
S |
S |
29.8 |
Multiple modes |
– |
– |
– |
– |
– |
– |
– |
Parcel, USPS or courier |
– |
– |
– |
– |
– |
– |
– |
All other multiple modes |
– |
– |
– |
– |
– |
– |
– |
Other and unknown modes |
S |
S |
S |
S |
S |
S |
29.8 |
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 |
14.4 |
– |
13.5 |
– |
23.6 |
– |
19.4 |
Single modes |
14.7 |
1.0 |
13.7 |
0.4 |
24.7 |
3.6 |
19.7 |
Truck |
14.7 |
1.0 |
13.7 |
0.4 |
24.8 |
3.6 |
19.7 |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
S |
S |
S |
S |
S |
S |
31.3 |
Multiple modes |
S |
S |
S |
S |
S |
S |
27.9 |
Parcel, USPS or courier |
– |
– |
– |
– |
– |
– |
– |
All other multiple modes |
S |
S |
S |
S |
S |
S |
27.9 |
Other and unknown modes |
– |
– |
– |
– |
– |
– |
– |
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 |
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 |
– |
– |
– |
– |
– |
– |
– |
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 |
33.4 |
– |
37.0 |
– |
43.3 |
– |
S |
Single modes |
33.4 |
0.7 |
36.9 |
– |
43.3 |
– |
S |
Truck |
33.4 |
0.7 |
36.9 |
– |
43.3 |
– |
S |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
– |
– |
– |
– |
– |
– |
– |
Multiple modes |
S |
S |
S |
S |
S |
S |
30.1 |
Parcel, USPS or courier |
S |
S |
S |
S |
S |
S |
30.1 |
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 |
34.3 |
– |
29.2 |
– |
27.6 |
– |
16.3 |
Single modes |
23.6 |
12.6 |
30.4 |
5.3 |
29.0 |
9.2 |
31.1 |
Truck |
23.5 |
12.6 |
30.3 |
4.9 |
29.1 |
8.9 |
31.2 |
Rail |
43.6 |
0.2 |
44.3 |
1.1 |
47.6 |
2.2 |
27.2 |
All other Single modes |
S |
S |
S |
S |
S |
S |
27.8 |
Multiple modes |
S |
S |
S |
S |
43.3 |
7.7 |
13.7 |
Parcel, USPS or courier |
S |
S |
S |
S |
42.7 |
7.7 |
13.7 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
29.9 |
Other and unknown modes |
41.7 |
1.4 |
36.9 |
3.8 |
43.2 |
3.9 |
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 |
15.8 |
– |
22.1 |
– |
33.2 |
– |
16.5 |
Single modes |
16.6 |
4.6 |
23.1 |
1.7 |
39.3 |
5.1 |
28.9 |
Truck |
10.5 |
5.0 |
17.9 |
5.0 |
18.2 |
8.0 |
29.8 |
Rail |
S |
S |
S |
S |
S |
S |
12.5 |
All other Single modes |
S |
S |
S |
S |
S |
S |
28.1 |
Multiple modes |
32.7 |
3.8 |
S |
S |
S |
S |
11.5 |
Parcel, USPS or courier |
33.3 |
3.8 |
S |
S |
S |
S |
11.5 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
31.1 |
Other and unknown modes |
31.4 |
1.9 |
33.6 |
1.7 |
45.8 |
5.4 |
32.7 |
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 |
20.3 |
– |
38.1 |
– |
12.2 |
– |
18.9 |
Single modes |
18.4 |
2.8 |
39.3 |
2.0 |
12.6 |
2.8 |
36.5 |
Truck |
19.0 |
3.8 |
41.2 |
3.7 |
15.1 |
5.2 |
36.6 |
Rail |
40.6 |
1.5 |
38.7 |
3.7 |
40.5 |
5.9 |
24.7 |
All other Single modes |
S |
S |
S |
S |
S |
S |
26.3 |
Multiple modes |
S |
S |
S |
S |
S |
S |
14.8 |
Parcel, USPS or courier |
S |
S |
40.7 |
– |
46.1 |
0.1 |
14.9 |
All other multiple modes |
47.8 |
0.4 |
S |
S |
S |
S |
25.8 |
Other and unknown modes |
36.3 |
2.4 |
48.8 |
0.9 |
42.9 |
0.5 |
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 |
S |
S |
S |
S |
47.5 |
– |
15.4 |
Single modes |
S |
S |
S |
S |
49.0 |
3.9 |
20.1 |
Truck |
S |
S |
S |
S |
49.0 |
3.9 |
18.8 |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
47.5 |
0.5 |
36.0 |
– |
39.9 |
– |
18.7 |
Multiple modes |
S |
S |
33.9 |
1.7 |
27.7 |
3.0 |
13.5 |
Parcel, USPS or courier |
S |
S |
33.9 |
1.7 |
27.7 |
3.0 |
13.5 |
All other multiple modes |
– |
– |
– |
– |
– |
– |
– |
Other and unknown modes |
40.0 |
0.7 |
47.3 |
1.3 |
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 |
33.9 |
– |
38.4 |
– |
43.4 |
– |
16.9 |
Single modes |
31.8 |
2.3 |
35.7 |
2.0 |
42.5 |
1.3 |
14.2 |
Truck |
31.8 |
2.3 |
35.8 |
4.8 |
47.0 |
9.9 |
14.9 |
Rail |
43.8 |
0.2 |
41.7 |
3.7 |
43.8 |
9.4 |
26.3 |
All other Single modes |
S |
S |
39.7 |
– |
S |
S |
29.0 |
Multiple modes |
S |
S |
44.7 |
0.1 |
45.1 |
0.8 |
10.9 |
Parcel, USPS or courier |
S |
S |
46.7 |
– |
S |
S |
11.0 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
28.1 |
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 |
49.2 |
– |
43.4 |
– |
S |
S |
22.8 |
Single modes |
S |
S |
S |
S |
S |
S |
30.7 |
Truck |
S |
S |
S |
S |
S |
S |
30.7 |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
– |
– |
– |
– |
– |
– |
– |
Multiple modes |
S |
S |
46.4 |
18.3 |
45.7 |
18.3 |
25.4 |
Parcel, USPS or courier |
S |
S |
46.4 |
18.3 |
45.7 |
18.3 |
25.4 |
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.