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 | 5.5 | – | 15.6 | – | 6.3 | – | 9.1 |
Single modes | 5.2 | 0.9 | 15.9 | 0.8 | 6.7 | 0.7 | 16.9 |
Truck | 5.3 | 1.2 | 19.2 | 4.6 | 9.8 | 4.1 | 15.1 |
Rail | 30.2 | 0.6 | 34.3 | 3.2 | 24.4 | 4.5 | 16.0 |
All other Single modes | 37.6 | 0.7 | S | S | S | S | 9.5 |
Multiple modes | 10.4 | 0.7 | 12.6 | – | 12.6 | 0.2 | 6.0 |
Parcel, USPS or courier | 10.5 | 0.7 | 9.0 | – | 9.4 | 0.1 | 6.0 |
All other multiple modes | 38.1 | – | 35.5 | – | 24.0 | 0.2 | 17.3 |
Other and unknown modes | 32.7 | 0.7 | 27.0 | 0.8 | 38.2 | 0.7 | 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.