Table B-2. Estimated Measures of Reliability for Inbound Shipment Characteristics by Mode of Transportation for CBSA of Destination: 2002
Table B-2. Estimated Measures of Reliability for Inbound Shipment Characteristics by Mode of Transportation for CBSA of Destination: 2002
[Estimates are based on data from the Commodity Flow Survey. Because of rounding, estimates may not be additive]
| 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 | 7.7 | – | 8.7 | – | 16.1 | – | 8.4 |
| Single modes | 8.8 | 1.7 | 8.8 | 0.2 | 16.2 | 0.3 | 13.5 |
| Truck | 9.4 | 2.5 | 6.9 | 6.8 | 10.8 | 7.3 | 16.8 |
| Rail | 34.6 | 1.8 | 23.2 | 4.3 | 27.6 | 8.5 | 12.9 |
| All other Single modes | 33.0 | 2.0 | S | S | 25.5 | 3.3 | 5.9 |
| Multiple modes | 9.9 | 1.2 | 27.1 | 0.2 | 22.9 | 0.3 | 3.5 |
| Parcel, USPS or courier | 12.8 | 1.4 | 14.3 | – | 12.2 | – | 3.5 |
| All other multiple modes | 30.9 | 0.4 | 40.4 | 0.2 | 37.3 | 0.3 | 17.5 |
| Other and unknown modes | 25.7 | 0.5 | 28.6 | 0.1 | 46.6 | 0.2 | 42.7 |
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.