Table B-6. Estimated Measures of Reliability for Shipment Characteristics by Commodity Group and Mode of Transportation for CBSA of Origin: 2002
Monday, July 2, 2012
Table B-6. Estimated Measures of Reliability for Shipment Characteristics by Commodity Group and Mode of Transportation for CBSA of Origin: 2002
[Estimates are based on data from the Commodity Flow Survey. Because of rounding, estimates may not be additive]
All Commodities
| Mode of transportation | 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 modes | 9.9 | – | 20.2 | – | 15.9 | – | 26.1 |
| Single modes | 10.2 | 0.7 | 20.2 | – | 16.1 | 0.5 | 21.4 |
| Truck | 14.2 | 6.5 | 44.5 | 9.0 | 22.6 | 7.3 | 23.7 |
| Rail | 18.4 | 1.8 | 30.0 | 7.6 | 22.8 | 6.3 | 23.5 |
| All other Single modes | 35.5 | 6.8 | 29.9 | 8.0 | 28.9 | 10.3 | 25.4 |
| Multiple modes | 21.4 | 0.6 | 26.5 | – | 31.5 | 0.3 | 9.7 |
| Parcel, USPS or courier | 27.6 | 0.6 | 35.2 | – | 40.7 | – | 10.0 |
| All other multiple modes | 36.6 | 0.2 | 33.5 | – | 36.1 | 0.3 | 21.2 |
| Other and unknown modes | 19.1 | 0.2 | 19.6 | – | 36.0 | 0.2 | 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.