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 |
11.6 |
– |
14.9 |
– |
14.7 |
– |
14.7 |
Single modes |
12.2 |
1.4 |
15.0 |
0.2 |
14.6 |
0.6 |
18.3 |
Truck |
11.9 |
1.6 |
15.0 |
1.7 |
15.4 |
4.4 |
14.2 |
Rail |
21.6 |
0.9 |
21.5 |
1.8 |
20.8 |
4.7 |
14.5 |
All other Single modes |
37.1 |
0.3 |
48.3 |
– |
42.6 |
– |
3.6 |
Multiple modes |
20.1 |
0.8 |
39.7 |
– |
45.0 |
0.4 |
8.6 |
Parcel, USPS or courier |
21.6 |
0.8 |
20.3 |
– |
18.2 |
– |
8.5 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
45.2 |
Other and unknown modes |
42.4 |
1.0 |
31.8 |
0.2 |
45.1 |
0.4 |
22.9 |
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 |
35.3 |
– |
S |
S |
43.0 |
– |
21.9 |
Single modes |
35.8 |
3.6 |
S |
S |
43.0 |
0.6 |
S |
Truck |
35.5 |
4.4 |
S |
S |
40.8 |
4.9 |
S |
Rail |
S |
S |
S |
S |
S |
S |
31.6 |
All other Single modes |
S |
S |
S |
S |
S |
S |
31.6 |
Multiple modes |
S |
S |
S |
S |
S |
S |
26.1 |
Parcel, USPS or courier |
S |
S |
S |
S |
S |
S |
26.1 |
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 |
17.7 |
– |
28.4 |
– |
42.6 |
– |
25.3 |
Single modes |
17.9 |
0.5 |
28.5 |
0.3 |
42.7 |
0.2 |
17.7 |
Truck |
19.1 |
4.7 |
32.7 |
8.3 |
34.5 |
13.9 |
13.8 |
Rail |
S |
S |
S |
S |
S |
S |
31.6 |
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 |
44.9 |
0.4 |
S |
S |
S |
S |
29.4 |
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 |
S |
S |
29.5 |
– |
29.8 |
– |
26.4 |
Single modes |
S |
S |
29.5 |
– |
29.8 |
– |
26.4 |
Truck |
S |
S |
31.2 |
4.0 |
28.9 |
5.1 |
26.3 |
Rail |
42.1 |
5.2 |
S |
S |
45.0 |
5.1 |
34.2 |
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 |
38.3 |
– |
48.6 |
– |
45.2 |
– |
S |
Single modes |
38.3 |
2.4 |
48.6 |
2.4 |
45.2 |
3.2 |
S |
Truck |
38.3 |
2.4 |
48.6 |
2.4 |
45.2 |
3.2 |
S |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
– |
– |
– |
– |
– |
– |
– |
Multiple modes |
S |
S |
S |
S |
S |
S |
30.4 |
Parcel, USPS or courier |
S |
S |
S |
S |
S |
S |
30.4 |
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 |
19.1 |
– |
26.9 |
– |
21.7 |
– |
34.3 |
Single modes |
19.3 |
1.1 |
27.1 |
0.4 |
22.4 |
2.2 |
S |
Truck |
21.1 |
3.7 |
36.7 |
7.5 |
23.0 |
5.7 |
S |
Rail |
14.1 |
3.8 |
14.8 |
7.3 |
29.5 |
6.2 |
26.7 |
All other Single modes |
S |
S |
43.9 |
– |
S |
S |
25.4 |
Multiple modes |
26.1 |
0.9 |
40.9 |
0.1 |
S |
S |
12.8 |
Parcel, USPS or courier |
27.9 |
0.8 |
25.8 |
– |
31.9 |
– |
12.8 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
30.5 |
Other and unknown modes |
38.0 |
0.3 |
44.4 |
0.4 |
49.4 |
0.1 |
30.7 |
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 |
34.6 |
– |
28.7 |
– |
35.9 |
– |
11.9 |
Single modes |
37.2 |
4.0 |
29.4 |
2.1 |
36.0 |
1.1 |
14.3 |
Truck |
36.8 |
3.9 |
29.4 |
4.1 |
37.5 |
5.0 |
11.5 |
Rail |
45.7 |
1.3 |
34.5 |
3.5 |
36.6 |
5.2 |
7.4 |
All other Single modes |
S |
S |
S |
S |
S |
S |
26.1 |
Multiple modes |
43.4 |
2.2 |
47.9 |
0.3 |
37.1 |
0.4 |
13.9 |
Parcel, USPS or courier |
S |
S |
30.6 |
0.1 |
27.9 |
0.1 |
13.8 |
All other multiple modes |
S |
S |
S |
S |
47.8 |
0.4 |
S |
Other and unknown modes |
S |
S |
45.1 |
2.0 |
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 |
13.7 |
– |
33.7 |
– |
15.9 |
– |
24.4 |
Single modes |
14.3 |
3.1 |
33.9 |
0.4 |
15.8 |
0.2 |
35.2 |
Truck |
14.4 |
3.6 |
36.5 |
4.9 |
14.8 |
6.0 |
35.3 |
Rail |
25.4 |
2.3 |
26.1 |
4.7 |
24.6 |
5.9 |
16.2 |
All other Single modes |
S |
S |
S |
S |
S |
S |
22.0 |
Multiple modes |
S |
S |
33.0 |
– |
34.7 |
– |
13.9 |
Parcel, USPS or courier |
S |
S |
32.9 |
– |
34.6 |
– |
13.9 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
31.6 |
Other and unknown modes |
37.3 |
0.3 |
S |
S |
S |
S |
28.2 |
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 |
19.5 |
– |
18.4 |
– |
22.8 |
– |
23.5 |
Single modes |
20.2 |
2.2 |
18.4 |
0.5 |
22.8 |
0.2 |
S |
Truck |
21.1 |
3.4 |
18.7 |
1.1 |
23.1 |
1.0 |
S |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
S |
S |
S |
S |
S |
S |
13.3 |
Multiple modes |
32.0 |
2.1 |
21.1 |
0.2 |
26.1 |
0.2 |
13.6 |
Parcel, USPS or courier |
32.0 |
2.1 |
21.1 |
0.2 |
26.1 |
0.2 |
13.6 |
All other multiple modes |
– |
– |
– |
– |
– |
– |
– |
Other and unknown modes |
S |
S |
45.6 |
0.4 |
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 |
35.6 |
– |
39.6 |
– |
28.5 |
– |
44.9 |
Single modes |
36.6 |
2.8 |
39.6 |
0.2 |
28.6 |
0.5 |
22.4 |
Truck |
36.7 |
2.8 |
39.6 |
0.2 |
28.6 |
0.5 |
21.4 |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
S |
S |
S |
S |
S |
S |
23.9 |
Multiple modes |
37.0 |
2.7 |
42.0 |
0.2 |
46.0 |
0.5 |
16.1 |
Parcel, USPS or courier |
37.0 |
2.7 |
42.0 |
0.2 |
46.0 |
0.5 |
16.1 |
All other multiple modes |
– |
– |
– |
– |
– |
– |
– |
Other and unknown modes |
S |
S |
S |
S |
S |
S |
41.8 |
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 |
47.7 |
– |
S |
S |
25.0 |
Single modes |
46.1 |
7.7 |
47.9 |
0.2 |
S |
S |
27.8 |
Truck |
46.1 |
7.7 |
47.9 |
0.2 |
S |
S |
27.8 |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
– |
– |
– |
– |
– |
– |
– |
Multiple modes |
S |
S |
S |
S |
S |
S |
27.2 |
Parcel, USPS or courier |
S |
S |
S |
S |
S |
S |
27.2 |
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.