Table 2c. Shipment Characteristics by Total Modal Activity for the United States: 2002 and 1993

[Estimates are based on data from the 2002 and 1993 Commodity Flow Surveys. Because of rounding, estimates may not be additive]

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Table 4b. Shipment Characteristics by Shipment Weight: 2002 and 1997

[Estimates are based on data from the 2002 and 1997 Commodity Flow Surveys. Because of rounding, estimates may not be additive]

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Appendix B - Reliability of the Estimates

The estimates in this publication may differ from the actual, unknown population values. Statisticians define this difference as the total error of the estimate. When describing the accuracy of survey results, it is convenient to discuss total error...

Table B-11a. Estimated Measures of Reliability for Shipment Characteristics by Mode of Transportation for the United States: 2002 and 1997

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

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Table B-2e. Estimated Standard Errors for Shipment Characteristics by Total Modal Activity for the United States: Percent of Total for 2002, 1997, and 1993

[Estimates are shown as percents and are based on data from the 2002, 1997, and 1993 Commodity Flow Surveys]

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Table B-10b. Estimated Measures of Reliability for Shipments by Two-Digit Commodity and Shipment Size by Distance: 2002

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

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Table 9. Shipment Characteristics by Two-Digit Commodity and Shipment Size: 2002

[Estimates are based on data from the 2002 Commodity Flow Survey. Because of rounding, estimates may not be additive]

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Table B-10a. Estimated Measures of Reliability for Shipments by Two-Digit Commodity and Shipment Size by Distance: 2002

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

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Table B-3e. Estimated Standard Error of Percentage for Shipment Characteristics by Distance Shipped: Percent of Total for 2002, 1997 and 1993

[Estimates are shown as percents and are based on data from the 2002, 1997, and 1993 Commodity Flow Surveys]

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Table B-11b. Estimated Measures of Reliability for Shipment Characteristics by Mode of Transportation for the United States: 2002 and 1993

[Estimates are based on data from the 2002 and 1993 Commodity Flow Surveys. Because of rounding, estimates may not be additive]

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