Table B-4. Estimated Measures of Reliability for Shipment Characteristics by Mode of Transportation and Shipment Size for CBSA of Origin: 2002

Table B-4. Estimated Measures of Reliability for Shipment Characteristics by Mode of Transportation and Shipment Size 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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Shipment Weight 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 shipment sizes 40.4 21.3 21.0 S
Less than 50 lbs 17.2 2.3 25.0 43.6 1.7 38.0
50 to 99 lbs 45.4 2.9 34.8 35.1 0.1 29.5
100 to 499 lbs 25.3 4.2 33.9 0.4 29.5 0.3 16.6
500 to 749 lbs 42.8 0.6 S S 40.1 0.2 35.1
750 to 999 lbs 42.9 0.4 S S 41.8 0.1 33.6
1,000 to 9,999 lbs S S S S 44.5 3.3 30.7
10,000 to 49,999 lbs S S 24.8 7.4 26.5 6.7 31.7
50,000 to 99,999 lbs S S 36.3 1.5 27.9 0.8 47.9
100,000 lbs or more S S S S S S S

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.