BTS | Table B–2b. Estimated Measures of Reliability for Shipment Characteristics by Total Modal Activity for the United States: 2002 and 1997

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BTS Home > Publications > Commodity Flow Survey > United States

Table B–2b. Estimated Measures of Reliability for Shipment Characteristics by Total Modal Activity 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]

Excel | CSV

Mode of transportation	Ton-miles CV		Std. error of percent change	Average miles per shipment CV		Std. error of percent change
Mode of transportation	2002	1997	Std. error of percent change	2002	1997	Std. error of percent change
Total	3.7	2.3	5.3	2.8	2.6	4.3
Truck	2.8	1.7	4.1	3.6	2.8	4.9
Rail	7.6	5.3	11.3	6.1	2.6	6.6
Shallow draft	9.4	5.5	12.9	13.1	20.9	44.5
Great Lakes	18.1	14.1	29.5	16.0	10.8	17.7
Deep draft	17.3	17.3	26.2	11.1	13.0	19.2
Air	15.7	7.8	17.1	4.3	1.8	6.6
Parcel, U.S.P.S. or courier	4.2	4.0	6.6	2.3	2.6	3.8
Pipeline	S	S	S	S	S	S
Other and unknown modes	9.7	8.5	7.8	13.0	9.6	17.2

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. CV Coefficient of variation of number.

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.

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