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 |
3.9 |
– |
20.6 |
– |
8.9 |
– |
8.9 |
Single modes |
3.6 |
2.8 |
21.6 |
1.1 |
10.6 |
2.2 |
11.1 |
Truck |
4.4 |
2.9 |
27.4 |
5.2 |
12.4 |
6.1 |
13.2 |
Rail |
28.6 |
1.0 |
47.6 |
3.8 |
39.5 |
5.5 |
41.2 |
All other Single modes |
17.5 |
0.5 |
25.6 |
4.1 |
25.2 |
4.0 |
7.5 |
Multiple modes |
17.8 |
2.8 |
28.7 |
0.8 |
24.8 |
2.1 |
7.7 |
Parcel, USPS or courier |
17.7 |
2.5 |
38.0 |
0.3 |
15.6 |
0.3 |
7.8 |
All other multiple modes |
36.1 |
0.7 |
37.0 |
0.7 |
28.7 |
2.0 |
32.4 |
Other and unknown modes |
14.8 |
0.3 |
35.7 |
0.8 |
31.9 |
0.4 |
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 |
34.3 |
– |
17.3 |
– |
11.9 |
– |
S |
Single modes |
37.4 |
4.9 |
17.6 |
1.0 |
12.2 |
1.2 |
S |
Truck |
40.5 |
10.5 |
43.6 |
8.6 |
43.5 |
6.1 |
S |
Rail |
S |
S |
S |
S |
S |
S |
S |
All other Single modes |
10.3 |
10.0 |
12.3 |
8.7 |
12.0 |
7.0 |
11.0 |
Multiple modes |
S |
S |
46.6 |
– |
S |
S |
27.3 |
Parcel, USPS or courier |
S |
S |
S |
S |
S |
S |
25.7 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
30.3 |
Other and unknown modes |
S |
S |
S |
S |
S |
S |
30.5 |
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 |
16.6 |
– |
23.8 |
– |
15.9 |
– |
45.3 |
Single modes |
16.3 |
1.4 |
24.5 |
1.8 |
18.5 |
5.7 |
S |
Truck |
18.1 |
4.6 |
26.4 |
5.0 |
23.6 |
7.4 |
S |
Rail |
S |
S |
S |
S |
S |
S |
26.6 |
All other Single modes |
S |
S |
S |
S |
S |
S |
S |
Multiple modes |
S |
S |
S |
S |
S |
S |
46.7 |
Parcel, USPS or courier |
S |
S |
S |
S |
S |
S |
24.4 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
26.4 |
Other and unknown modes |
37.8 |
0.3 |
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 |
46.1 |
– |
S |
S |
S |
S |
S |
Single modes |
46.5 |
4.0 |
S |
S |
S |
S |
S |
Truck |
47.9 |
6.1 |
S |
S |
S |
S |
S |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
S |
S |
S |
S |
S |
S |
28.6 |
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 |
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 |
30.7 |
– |
27.0 |
– |
46.8 |
– |
16.5 |
Single modes |
31.0 |
2.0 |
27.4 |
3.5 |
43.8 |
5.0 |
16.1 |
Truck |
42.0 |
8.0 |
41.2 |
9.4 |
S |
S |
17.1 |
Rail |
36.1 |
0.4 |
35.6 |
0.3 |
40.5 |
5.1 |
16.9 |
All other Single modes |
33.9 |
8.3 |
37.8 |
9.5 |
S |
S |
39.8 |
Multiple modes |
S |
S |
S |
S |
S |
S |
45.8 |
Parcel, USPS or courier |
S |
S |
S |
S |
S |
S |
37.0 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
30.9 |
Other and unknown modes |
S |
S |
S |
S |
S |
S |
S |
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 |
23.1 |
– |
34.5 |
– |
38.6 |
– |
16.5 |
Single modes |
24.3 |
2.7 |
35.8 |
3.1 |
40.6 |
3.8 |
20.6 |
Truck |
24.7 |
2.6 |
31.3 |
6.8 |
35.0 |
7.5 |
18.5 |
Rail |
37.4 |
1.6 |
S |
S |
S |
S |
9.7 |
All other Single modes |
33.6 |
0.8 |
S |
S |
S |
S |
15.3 |
Multiple modes |
25.7 |
2.7 |
S |
S |
S |
S |
7.2 |
Parcel, USPS or courier |
25.9 |
2.2 |
30.7 |
0.4 |
40.2 |
0.4 |
7.4 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
18.5 |
Other and unknown modes |
37.0 |
0.3 |
32.0 |
0.2 |
46.5 |
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 |
15.3 |
– |
26.7 |
– |
26.6 |
– |
12.9 |
Single modes |
17.3 |
3.0 |
26.5 |
1.1 |
23.2 |
4.3 |
21.1 |
Truck |
17.3 |
3.0 |
26.5 |
1.1 |
23.0 |
4.4 |
21.1 |
Rail |
S |
S |
S |
S |
S |
S |
31.4 |
All other Single modes |
S |
S |
S |
S |
S |
S |
20.5 |
Multiple modes |
20.6 |
3.0 |
42.5 |
1.0 |
S |
S |
6.8 |
Parcel, USPS or courier |
18.3 |
2.7 |
22.5 |
0.7 |
27.8 |
3.0 |
6.9 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
S |
Other and unknown modes |
37.8 |
0.7 |
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 |
10.8 |
– |
30.4 |
– |
18.9 |
– |
11.9 |
Single modes |
12.5 |
3.0 |
30.8 |
1.1 |
19.5 |
1.2 |
13.3 |
Truck |
13.1 |
3.6 |
30.9 |
1.1 |
18.5 |
1.5 |
14.8 |
Rail |
S |
S |
S |
S |
S |
S |
27.3 |
All other Single modes |
S |
S |
S |
S |
S |
S |
12.6 |
Multiple modes |
25.1 |
3.3 |
S |
S |
45.6 |
1.1 |
14.8 |
Parcel, USPS or courier |
26.6 |
3.4 |
14.2 |
0.4 |
19.9 |
0.7 |
15.1 |
All other multiple modes |
42.5 |
0.3 |
S |
S |
S |
S |
32.0 |
Other and unknown modes |
35.8 |
1.2 |
42.9 |
0.8 |
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 |
16.1 |
– |
S |
S |
S |
S |
5.8 |
Single modes |
15.7 |
5.7 |
S |
S |
S |
S |
15.5 |
Truck |
14.1 |
5.8 |
36.8 |
10.7 |
29.0 |
14.3 |
16.9 |
Rail |
S |
S |
S |
S |
S |
S |
32.6 |
All other Single modes |
44.3 |
0.9 |
S |
S |
S |
S |
7.6 |
Multiple modes |
24.5 |
5.8 |
23.3 |
3.9 |
14.7 |
7.6 |
7.3 |
Parcel, USPS or courier |
26.3 |
6.6 |
30.6 |
3.8 |
21.0 |
5.9 |
7.3 |
All other multiple modes |
44.3 |
1.5 |
40.7 |
1.4 |
38.3 |
5.0 |
24.4 |
Other and unknown modes |
40.7 |
0.6 |
33.9 |
1.3 |
40.9 |
0.7 |
40.4 |
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 |
19.7 |
– |
47.1 |
– |
22.3 |
– |
14.2 |
Single modes |
17.9 |
4.2 |
48.0 |
4.5 |
22.5 |
3.8 |
20.0 |
Truck |
18.1 |
5.2 |
37.0 |
7.8 |
20.0 |
6.1 |
20.9 |
Rail |
S |
S |
S |
S |
S |
S |
S |
All other Single modes |
47.8 |
– |
33.3 |
– |
30.9 |
– |
38.3 |
Multiple modes |
35.5 |
3.9 |
S |
S |
28.8 |
2.0 |
12.1 |
Parcel, USPS or courier |
33.1 |
2.5 |
S |
S |
36.6 |
1.5 |
12.1 |
All other multiple modes |
S |
S |
S |
S |
33.6 |
2.0 |
39.4 |
Other and unknown modes |
43.5 |
1.2 |
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 |
24.6 |
– |
43.9 |
– |
46.2 |
– |
26.8 |
Single modes |
26.9 |
4.4 |
44.0 |
1.1 |
47.6 |
7.2 |
28.3 |
Truck |
26.9 |
4.4 |
44.0 |
1.1 |
47.6 |
7.2 |
28.3 |
Rail |
– |
– |
– |
– |
– |
– |
– |
All other Single modes |
– |
– |
– |
– |
– |
– |
– |
Multiple modes |
36.7 |
4.5 |
43.2 |
1.1 |
44.4 |
7.2 |
23.3 |
Parcel, USPS or courier |
39.6 |
4.6 |
S |
S |
S |
S |
25.4 |
All other multiple modes |
S |
S |
S |
S |
S |
S |
31.6 |
Other and unknown modes |
S |
S |
S |
S |
S |
S |
32.5 |
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.