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 | 40.4 | – | 21.3 | – | 21.0 | – | S |
| Single modes | 45.4 | 6.5 | 21.5 | 0.4 | 21.0 | 1.7 | 42.9 |
| Truck | 45.7 | 6.5 | 23.7 | 6.4 | 22.4 | 4.9 | 43.6 |
| Rail | S | S | S | S | S | S | 31.6 |
| All other Single modes | 46.2 | 0.9 | S | S | S | S | 25.1 |
| Multiple modes | 47.1 | 6.6 | 44.1 | 0.4 | 32.7 | 1.7 | 25.3 |
| Parcel, USPS or courier | 49.6 | 6.7 | 47.7 | 0.4 | 38.1 | 1.8 | 25.3 |
| All other multiple modes | S | S | S | S | S | S | 31.6 |
| Other and unknown modes | 36.5 | 0.7 | 45.7 | 0.1 | S | S | 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.