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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 7.5 – 23.0 – 12.8 – 25.9
Less than 50 lbs 25.8 2.8 31.1 – 39.8 0.3 21.0
50 to 99 lbs 16.7 0.4 S S 34.9 0.1 S
100 to 499 lbs 18.4 1.7 S S 26.1 0.3 S
500 to 749 lbs 28.7 0.9 23.9 – 18.2 – 45.2
750 to 999 lbs 17.0 0.3 22.6 – 19.4 – S
1,000 to 9,999 lbs 15.0 1.9 20.2 1.1 16.7 0.3 41.5
10,000 to 49,999 lbs 4.7 3.0 17.1 7.5 15.5 4.0 15.9
50,000 to 99,999 lbs 37.8 1.7 S S S S 33.4
100,000 lbs or more 27.2 2.4 S S 18.3 5.6 8.1

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 4.9 – 23.5 – 13.5 – S
Less than 50 lbs 15.7 1.2 S S 27.6 – S
50 to 99 lbs 18.0 0.4 S S S S S
100 to 499 lbs 18.6 1.7 S S 35.9 0.2 S
500 to 749 lbs 29.7 1.0 25.4 – 20.4 – 45.7
750 to 999 lbs 17.5 0.3 23.0 – 15.8 – S
1,000 to 9,999 lbs 15.6 2.3 21.6 1.1 16.4 0.3 44.9
10,000 to 49,999 lbs 5.0 2.6 17.4 7.8 15.9 4.1 17.0
50,000 to 99,999 lbs 38.3 2.0 S S S S 33.0
100,000 lbs or more 27.9 2.8 S S 18.3 5.6 8.8

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 6.2 – 23.3 – 19.4 – 35.6
Less than 50 lbs 30.8 1.5 S S 42.3 – 29.0
50 to 99 lbs 30.7 0.4 S S S S S
100 to 499 lbs 24.4 2.0 S S 37.6 0.3 S
500 to 749 lbs 34.2 1.2 25.5 – 20.6 – 39.0
750 to 999 lbs 17.3 0.3 23.1 – 17.5 – S
1,000 to 9,999 lbs 15.8 2.5 21.6 1.6 16.5 0.6 45.0
10,000 to 49,999 lbs 4.9 4.0 17.4 7.6 16.0 3.3 17.2
50,000 to 99,999 lbs 38.4 2.1 S S S S 30.9
100,000 lbs or more S S S S S S 24.1

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 25.1 – S S 18.7 – 10.9
Less than 50 lbs S S S S S S 31.6
50 to 99 lbs – – – – – – –
100 to 499 lbs S S S S S S 31.6
500 to 749 lbs – – – – – – –
750 to 999 lbs – – – – – – –
1,000 to 9,999 lbs S S S S S S S
10,000 to 49,999 lbs S S 41.7 – 47.0 0.2 34.1
50,000 to 99,999 lbs 35.4 0.4 34.5 0.2 48.7 0.3 34.6
100,000 lbs or more 26.0 2.1 S S 18.8 0.4 10.0

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 29.5 – 37.2 – S S 14.9
Less than 50 lbs 28.3 4.3 34.7 7.2 46.7 10.5 14.3
50 to 99 lbs 36.2 4.0 37.2 3.2 46.5 2.4 38.3
100 to 499 lbs 35.2 6.1 28.6 4.3 39.9 3.6 16.6
500 to 749 lbs S S S S S S 27.2
750 to 999 lbs S S S S S S 31.6
1,000 to 9,999 lbs 47.9 2.4 42.5 10.2 S S 29.8
10,000 to 49,999 lbs S S S S S S 29.5
50,000 to 99,999 lbs – – – – – – –
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 16.5 – 24.3 – 24.4 – 6.9
Less than 50 lbs 20.0 4.6 39.2 6.8 42.7 7.0 6.6
50 to 99 lbs 23.4 1.7 37.6 2.3 44.0 2.4 16.7
100 to 499 lbs 32.6 3.5 41.5 4.0 43.2 4.4 10.9
500 to 749 lbs 49.3 0.7 S S S S 27.4
750 to 999 lbs S S S S S S 27.7
1,000 to 9,999 lbs S S S S S S 31.6
10,000 to 49,999 lbs S S S S S S 28.8
50,000 to 99,999 lbs S S S S S S 31.6
100,000 lbs or more S S S S S S 31.6

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 16.6 – 31.9 – 36.5 – 6.9
Less than 50 lbs 20.0 4.7 39.2 4.4 42.7 3.5 6.6
50 to 99 lbs 23.4 1.7 37.6 2.1 44.0 1.7 16.7
100 to 499 lbs 32.7 3.5 41.7 3.6 44.8 3.9 10.5
500 to 749 lbs 49.3 0.7 S S S S 27.4
750 to 999 lbs S S S S S S 27.7
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 35.6 – 42.1 – 42.0 – 26.5
Less than 50 lbs – – – – – – –
50 to 99 lbs – – – – – – –
100 to 499 lbs S S S S S S 31.6
500 to 749 lbs – – – – – – –
750 to 999 lbs – – – – – – –
1,000 to 9,999 lbs S S S S S S 31.6
10,000 to 49,999 lbs S S S S S S 28.8
50,000 to 99,999 lbs S S S S S S 31.6
100,000 lbs or more S S S S S S 31.6

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 27.2 – 44.6 – S
Less than 50 lbs S S 35.1 1.3 S S S
50 to 99 lbs 39.4 2.3 46.9 1.3 S S 26.6
100 to 499 lbs 47.7 4.3 43.9 3.4 S S S
500 to 749 lbs S S S S S S S
750 to 999 lbs S S S S S S 30.1
1,000 to 9,999 lbs S S S S S S 35.8
10,000 to 49,999 lbs 47.4 12.3 S S S S 46.1
50,000 to 99,999 lbs S S S S S S 38.3
100,000 lbs or more 32.6 3.5 36.3 15.9 38.3 12.4 30.5

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.
Research and Innovative Technology Administration (RITA) • U.S. Department of Transportation (US DOT)
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