HAZMAT Table B–15b ,,,,,,
Estimated Standard Error of Percentage for Hazardous Material Shipment Characteristics for Packing Group I: Percent of Total for 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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Description,Value,,Tons,,Ton–miles,
,2002,1997,2002,1997,2002,1997
Total,—,—,—,—,—,—
Packing Group I,0.9,1.3,1.0,1.3,2.1,2.0
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KEY: 
— Represents an estimate equal to zero or less than 1 unit of measure.  
S Estimate does not meet publication standards because of highly sampling variability or poor response quality. 
CV Coefficient of variation of number",,,,,,
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NOTE: 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.",,,,,,
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SOURCE: Bureau of Transportation Statistics (USDOT) and U.S. Census Bureau, 2002 Commodity Flow Survey, Hazmat Data, December 2004.",,,,,,