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 | 4.9 | – | 12.8 | – | 11.4 | – | 9.0 |
Single modes | 5.7 | 1.0 | 13.1 | 0.6 | 12.2 | 1.5 | 23.6 |
Truck | 6.0 | 1.2 | 15.7 | 5.4 | 7.1 | 8.4 | 22.0 |
Rail | 25.9 | 0.1 | 45.1 | 4.1 | 47.8 | 8.5 | 10.9 |
All other Single modes | 43.9 | 0.5 | S | S | S | S | 13.1 |
Multiple modes | 5.9 | 0.8 | 23.3 | – | 18.0 | 0.2 | 7.6 |
Parcel, USPS or courier | 6.1 | 0.8 | 25.8 | – | 17.0 | 0.2 | 7.6 |
All other multiple modes | S | S | 35.0 | – | 36.0 | 0.1 | S |
Other and unknown modes | 27.4 | 0.5 | 33.9 | 0.7 | 37.3 | 1.5 | 24.5 |
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.