Table B-5b. Estimated Standard Errors for Shipment Characteristics by Two-Digit Commodity for the United States: Percent of Total for 2002 and 1997

Table B-5b. Estimated Standard Errors for Shipment Characteristics by Two-Digit Commodity for the United States: Percent of Total for 2002 and 1997

[Estimates are based on data from the 2002 and 1997 Commodity Flow Surveys]

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SCTG code Commodity description (2-digit) Value Tons Ton-miles
2002 1997 2002 1997 2002 1997
  Total
01 Live animals and live fish
02 Cereal grains 0.4 0.2 1.3 0.6
03 Other agricultural products 0.2 0.2 0.3 0.2
04 Animal feed and products of animal origin, n.e.c. 0.3 0.2
05 Meat, fish, seafood, and their preparations 0.1 0.1 0.1
06 Milled grain products and preparations, and
bakery products
0.1 0.1 0.1
07 Other prepared foodstuffs and fats and oils 0.2 0.1 0.2 0.1 0.4 0.2
08 Alcoholic beverages 0.1 0.1
09 Tobacco products 0.1
10 Monumental or building stone
11 Natural sands 0.4 0.4 0.1
12 Gravel and crushed stone 1.2 0.6 0.3 0.2
13 Nonmetallic minerals n.e.c. 0.2 0.3 0.3 0.3
14 Metallic ores and concentrates 0.1 0.1 0.3 0.4
15 Coal 0.8 0.5 2.4 1.6
17 Gasoline and aviation turbine fuel 0.2 0.2 0.5 0.4 0.4 0.6
18 Fuel oils 0.3 0.3 0.2 0.2
19 Coal and petroleum products, n.e.c. 0.4 0.3 0.3 0.4
20 Basic chemicals 0.1 0.3 0.4 0.2 0.4 0.7
21 Pharmaceutical products 0.5 0.2
22 Fertilizers 0.7 0.1 0.7 0.1
23 Chemical products and preparations, n.e.c. 0.1 0.1 0.1 0.1
24 Plastics and rubber 0.1 0.1 0.2 0.2
25 Logs and other wood in the rough S 0.1
26 Wood products 0.2 0.2 0.2 0.5 0.3
27 Pulp, newsprint, paper, and paperboard 0.2 0.1
28 Paper or paperboard articles
29 Printed products 0.1 0.6 0.1
30 Textiles, leather, and articles of textiles or leather 0.3 0.4 0.1
31 Nonmetallic mineral products 0.1 0.7 0.8 0.5 0.2
32
Base metal in primary or semifinished forms and
in finished basic shapes
0.2 0.1 0.2 0.2 0.3 0.2
33 Articles of base metal 0.1 0.1 0.1 0.2
34 Machinery 0.3 0.1 0.1
35
Electronic and other electrical equipment
and components and office equipment
0.5 0.4 0.1
36 Motorized and other vehicles (including parts) 0.6 0.3 0.2
37 Transportation equipment, n.e.c. 0.4 0.3 0.2
38 Precision instruments and apparatus 0.2 0.1
39
Furniture, mattresses and mattress supports,
lamps, lighting fittings, and...
0.1
40 Miscellaneous manufactured products 0.2 0.4 0.2 0.1
41 Waste and scrap 0.3 0.1 0.4 0.1
43 Mixed freight 0.4 0.3 0.1 0.1 0.1 0.1
-- Commodity unknown 0.1

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.

NOTES: The Introduction and appendixes give information on 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, United States Data, December 2004.