Table B-4e. Estimated Standard Error of Percentage for Shipment Characteristics by Shipment Weight: Percent of Total for 2002, 1997 and 1993
Monday, July 2, 2012
Table B-4e. Estimated Standard Error of Percentage for Shipment Characteristics by Shipment Weight: 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]
| Shipment Weight | Value | Tons | Ton-miles | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 2002 | 1997 | 1993 | 2002 | 1997 | 1993 | 2002 | 1997 | 1993 | |
| All shipment sizes | – | – | – | – | – | – | – | – | – |
| Less than 50 lbs | 0.3 | 0.2 | 0.1 | – | – | – | – | – | – |
| 50 to 99 lbs | 0.2 | – | – | – | – | – | – | – | – |
| 100 to 499 lbs | 0.3 | 0.2 | 0.2 | – | – | – | – | – | – |
| 500 to 749 lbs | 0.1 | – | 0.1 | – | – | – | – | – | – |
| 750 to 999 lbs | – | – | 0.1 | – | – | – | – | – | – |
| 1,000 to 9,999 lbs | 0.3 | 0.4 | 0.5 | 0.1 | – | 0.1 | 0.2 | 0.2 | 0.2 |
| 10,000 to 49,999 lbs | 0.5 | 0.5 | 0.6 | 0.8 | 0.7 | 0.6 | 0.9 | 0.8 | 0.7 |
| 50,000 to 99,999 lbs | 0.2 | 0.2 | 0.2 | 0.5 | 0.5 | 0.6 | 0.3 | 0.3 | 0.2 |
| 100,000 lbs or more | 0.5 | 0.3 | 0.4 | 1.0 | 0.9 | 0.9 | 1.3 | 1.1 | 1.0 |
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.