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 | 3.0 | – | 18.2 | – | 27.1 | – | 6.2 |
| Single modes | 3.4 | 1.2 | 19.1 | 1.2 | 30.1 | 3.8 | 15.9 |
| Truck | 3.4 | 1.2 | 21.3 | 4.8 | 21.0 | 8.0 | 19.3 |
| Rail | 34.4 | 0.2 | 18.7 | 0.3 | 20.0 | 2.7 | 10.6 |
| All other Single modes | 11.4 | 1.0 | 45.0 | 4.6 | S | S | 5.5 |
| Multiple modes | 4.9 | 0.9 | 24.9 | 0.4 | 42.0 | 3.7 | 6.7 |
| Parcel, USPS or courier | 4.2 | 0.8 | 6.6 | 0.1 | 10.7 | 0.5 | 6.7 |
| All other multiple modes | 30.5 | 0.3 | 39.9 | 0.4 | S | S | 18.8 |
| Other and unknown modes | 23.9 | 0.8 | 33.0 | 1.0 | 39.9 | 0.4 | 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.