Table B-3a. Estimated Measures of Reliability for Shipment Characteristics by Distance Shipped: 2002

Table B-3a. Estimated Measures of Reliability for Shipment Characteristics by Distance Shipped: 2002

[Estimates are shown as percents and are based on data from the 2002 Commodity Flow Survey]

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Distance Shipped (Based on Great Circle Distance) Value Tons Ton-miles
Coefficient of variation of number Standard error of percent Coefficient of variation of number Standard error of percent Coefficient of variation of number Standard error of percent
All distances 1.3 2.0 3.7
Less than 50 miles 1.4 0.4 3.2 1.0 3.9 0.2
50 to 99 miles 1.8 0.2 5.8 0.5 5.8 0.2
100 to 249 miles 2.0 0.3 2.9 0.4 2.8 0.4
250 to 499 miles 2.3 0.2 3.2 0.4 3.9 0.8
500 to 749 miles 3.4 0.3 3.1 0.2 3.6 0.6
750 to 999 miles 4.0 0.2 6.2 0.2 6.4 0.7
1,000 to 1,499 miles 3.3 0.2 11.2 0.4 12.0 1.7
1,500 to 1,999 miles 5.8 0.2 6.9 7.0 0.4
2,000 miles or more 6.3 0.2 3.9 4.3 0.2

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.

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, United States Data, December 2004.