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Table B–4. Estimated Measures of Reliability for Shipment Characteristics by Mode of Transportation and Shipment Size for CBSA of Origin: 2002

[Estimates are based on data from the Commodity Flow Survey. Because of rounding, estimates may not be additive]

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All modes

Shipment Weight 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 shipment sizes 26.0 – S S 41.3 – S
Less than 50 lbs S S S S 47.9 0.1 S
50 to 99 lbs S S S S S S S
100 to 499 lbs S S S S 34.0 0.8 S
500 to 749 lbs 39.1 1.1 S S 44.2 0.4 S
750 to 999 lbs 40.2 0.8 S S 41.4 0.9 S
1,000 to 9,999 lbs 33.4 8.8 S S 43.6 4.1 S
10,000 to 49,999 lbs 41.8 9.7 S S 47.5 7.4 S
50,000 to 99,999 lbs S S S S 49.4 9.2 S
100,000 lbs or more S S S S S S 31.6

Single modes

Shipment Weight 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 shipment sizes 32.2 – S S 43.6 – S
Less than 50 lbs S S 44.1 – 42.5 – S
50 to 99 lbs S S S S S S S
100 to 499 lbs S S 48.9 0.8 45.9 0.5 S
500 to 749 lbs 39.1 1.7 S S 41.1 0.4 S
750 to 999 lbs 47.3 1.6 S S 44.2 0.9 S
1,000 to 9,999 lbs 35.9 8.5 S S 46.5 4.2 S
10,000 to 49,999 lbs 48.3 9.5 S S S S S
50,000 to 99,999 lbs S S S S 49.4 9.2 S
100,000 lbs or more S S S S S S 31.6

Truck

Shipment Weight 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 shipment sizes 33.3 – S S 43.8 – S
Less than 50 lbs S S 44.1 – 43.6 – S
50 to 99 lbs S S S S S S S
100 to 499 lbs S S 48.9 0.8 45.9 0.5 S
500 to 749 lbs 39.1 1.7 S S 41.1 0.4 S
750 to 999 lbs 47.3 1.6 S S 44.2 0.9 S
1,000 to 9,999 lbs 35.9 8.4 S S 46.5 4.2 S
10,000 to 49,999 lbs 48.7 11.7 S S S S S
50,000 to 99,999 lbs S S S S S S 39.9
100,000 lbs or more S S S S S S 31.6

Rail

Shipment Weight 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 shipment sizes – – – – – – –
Less than 50 lbs – – – – – – –
50 to 99 lbs – – – – – – –
100 to 499 lbs – – – – – – –
500 to 749 lbs – – – – – – –
750 to 999 lbs – – – – – – –
1,000 to 9,999 lbs – – – – – – –
10,000 to 49,999 lbs – – – – – – –
50,000 to 99,999 lbs – – – – – – –
100,000 lbs or more – – – – – – –

All other Single modes

Shipment Weight 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 shipment sizes S S S S S S 30.6
Less than 50 lbs S S S S S S 31.6
50 to 99 lbs – – – – – – –
100 to 499 lbs – – – – – – –
500 to 749 lbs – – – – – – –
750 to 999 lbs – – – – – – –
1,000 to 9,999 lbs – – – – – – –
10,000 to 49,999 lbs S S S S S S 30.5
50,000 to 99,999 lbs S S S S S S 31.6
100,000 lbs or more – – – – – – –

Multiple modes

Shipment Weight 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 shipment sizes S S S S 47.5 – 32.3
Less than 50 lbs S S S S S S 32.3
50 to 99 lbs S S S S S S 29.6
100 to 499 lbs S S S S S S 31.9
500 to 749 lbs S S S S S S 37.2
750 to 999 lbs S S S S S S 31.6
1,000 to 9,999 lbs – – – – – – –
10,000 to 49,999 lbs – – – – – – –
50,000 to 99,999 lbs – – – – – – –
100,000 lbs or more – – – – – – –

Parcel, USPS or courier

Shipment Weight 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 shipment sizes S S S S 47.5 – 32.3
Less than 50 lbs S S S S S S 32.3
50 to 99 lbs S S S S S S 29.6
100 to 499 lbs S S S S S S 31.9
500 to 749 lbs S S S S S S 37.2
750 to 999 lbs S S S S S S 31.6
1,000 to 9,999 lbs – – – – – – –
10,000 to 49,999 lbs – – – – – – –
50,000 to 99,999 lbs – – – – – – –
100,000 lbs or more – – – – – – –

All other multiple modes

Shipment Weight 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 shipment sizes – – – – – – –
Less than 50 lbs – – – – – – –
50 to 99 lbs – – – – – – –
100 to 499 lbs – – – – – – –
500 to 749 lbs – – – – – – –
750 to 999 lbs – – – – – – –
1,000 to 9,999 lbs – – – – – – –
10,000 to 49,999 lbs – – – – – – –
50,000 to 99,999 lbs – – – – – – –
100,000 lbs or more – – – – – – –

Other and unknown modes

Shipment Weight 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 shipment sizes S S S S S S S
Less than 50 lbs S S S S S S S
50 to 99 lbs S S S S S S 31.6
100 to 499 lbs S S S S S S 33.4
500 to 749 lbs – – – – – – –
750 to 999 lbs S S S S S S 29.9
1,000 to 9,999 lbs S S S S S S 33.0
10,000 to 49,999 lbs S S S S S S 30.6
50,000 to 99,999 lbs – – – – – – –
100,000 lbs or more – – – – – – –

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.
Research and Innovative Technology Administration (RITA) • U.S. Department of Transportation (US DOT)
1200 New Jersey Avenue, SE • Washington, DC 20590 • 800-853-1351 • E-mail RITA

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