Table B-9. Estimated Measures of Reliability for Shipment Characteristics by Mode of Transportation for State of Origin: 2002 and 1997
Table B-9. Estimated Measures of Reliability for Shipment Characteristics by Mode of Transportation for State of Origin: 2002 and 1997
[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 | Average miles per shipment | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
CV 2002 |
CV 1997 |
Std. error of percent change 1997-2002 | CV 2002 |
CV 1997 |
Std. error of percent change 1997-2002 | CV 2002 |
CV 1997 |
Std. error of percent change 1997-2002 | CV 2002 |
CV 1997 |
Std. error of percent change 1997-2002 | |
All modes | 40.9 | 21.0 | 127.1 | 46.0 | 37.6 | 47.8 | 29.4 | 30.0 | 66.0 | 43.8 | S | S |
Single modes | 42.7 | 25.5 | 165.1 | 45.7 | 37.8 | 47.5 | 33.8 | 33.1 | 85.1 | 27.9 | S | S |
Truck | 42.7 | 25.9 | 169.2 | 45.7 | 37.8 | 47.5 | 33.8 | 38.5 | 102.7 | 30.7 | 25.2 | 52.2 |
Rail | S | – | S | S | – | S | S | – | S | 31.6 | – | – |
Water | – | S | S | – | S | S | – | S | S | – | 30.0 | – |
Air (including truck and air) | S | – | S | S | – | S | S | – | S | 26.1 | – | – |
Pipeline | – | – | – | – | – | – | S | S | S | S | S | S |
Multiple modes | 29.7 | S | S | 40.0 | S | S | S | S | S | 14.8 | 31.1 | 49.2 |
Parcel, USPS or courier | 29.7 | S | S | 40.0 | S | S | S | S | S | 14.8 | 31.1 | 49.2 |
Truck and rail | – | – | – | – | – | – | – | – | – | – | – | – |
Other Multiple modes | – | – | – | – | – | – | – | – | – | – | – | – |
Other and unknown modes | S | S | S | S | S | S | S | S | S | 21.0 | 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, Individual State Data, December 2004.