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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 18.2 – 11.4 – 10.8 – 13.6
Less than 50 lbs 22.3 1.9 17.7 – 26.6 0.2 11.3
50 to 99 lbs 25.9 0.7 22.8 – 17.2 – 31.6
100 to 499 lbs 13.0 1.3 15.7 0.2 17.0 0.3 29.2
500 to 749 lbs 18.9 0.5 12.6 – 25.3 0.2 42.9
750 to 999 lbs 22.1 0.2 25.7 – 15.8 – 35.4
1,000 to 9,999 lbs 9.6 2.5 16.2 2.0 20.9 3.7 21.6
10,000 to 49,999 lbs 9.7 3.3 9.7 3.3 11.3 4.4 13.1
50,000 to 99,999 lbs S S 22.2 3.6 S S S
100,000 lbs or more S S 48.6 3.7 S S S

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 21.2 – 11.7 – 11.1 – 29.6
Less than 50 lbs 16.9 0.3 21.2 – 42.2 – 36.4
50 to 99 lbs 25.1 0.4 35.6 – 28.5 – S
100 to 499 lbs 12.5 1.3 17.9 0.2 18.0 0.3 38.1
500 to 749 lbs 18.7 0.5 13.4 – 29.9 0.1 32.6
750 to 999 lbs 22.8 0.2 26.9 – 15.3 – 37.8
1,000 to 9,999 lbs 10.0 2.9 16.7 1.8 14.8 3.2 18.8
10,000 to 49,999 lbs 9.7 4.1 9.8 3.3 11.0 4.2 12.7
50,000 to 99,999 lbs S S 22.1 3.6 S S S
100,000 lbs or more S S 48.7 3.7 S S S

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 22.3 – 11.6 – 11.9 – 31.1
Less than 50 lbs 19.4 0.4 23.5 – 25.7 – S
50 to 99 lbs 25.3 0.4 36.7 – 30.9 – S
100 to 499 lbs 12.8 1.4 17.9 0.2 18.2 0.3 39.8
500 to 749 lbs 18.9 0.5 13.4 – 30.6 0.2 33.0
750 to 999 lbs 23.0 0.3 26.9 0.1 15.5 0.1 37.8
1,000 to 9,999 lbs 10.4 3.4 16.8 1.9 14.8 3.1 18.8
10,000 to 49,999 lbs 9.1 4.0 10.7 3.0 11.1 3.2 11.7
50,000 to 99,999 lbs S S 22.2 3.5 S S 35.0
100,000 lbs or more S S 36.1 2.4 44.7 0.8 S

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 38.0 – 31.3 – 35.2 – 31.0
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 S S S S 46.0 1.4 28.9
10,000 to 49,999 lbs S S S S 49.7 15.0 28.9
50,000 to 99,999 lbs S S S S S S S
100,000 lbs or more S S 46.1 11.6 S S 28.8

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 41.8 – S S S S 12.7
Less than 50 lbs 46.0 10.9 47.7 8.3 S S 12.6
50 to 99 lbs S S S S 39.5 4.8 32.4
100 to 499 lbs S S 48.3 11.0 S S 22.8
500 to 749 lbs S S S S S S 25.9
750 to 999 lbs S S S S S S 31.7
1,000 to 9,999 lbs S S S S 48.4 8.1 S
10,000 to 49,999 lbs S S S S S S 34.5
50,000 to 99,999 lbs – – – – – – –
100,000 lbs or more S S S S S S 31.6

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 26.9 – 23.0 – 23.6 – 9.7
Less than 50 lbs 27.9 4.0 25.1 4.7 29.6 6.0 9.8
50 to 99 lbs 38.4 2.2 33.4 2.6 22.7 1.8 21.1
100 to 499 lbs 27.0 5.1 33.1 6.4 37.6 5.3 10.0
500 to 749 lbs 47.0 2.0 42.5 1.4 S S 32.0
750 to 999 lbs S S S S S S 25.8
1,000 to 9,999 lbs S S S S S S 29.8
10,000 to 49,999 lbs S S S S S S 29.9
50,000 to 99,999 lbs – – – – – – –
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 27.4 – 25.1 – 28.5 – 9.7
Less than 50 lbs 27.9 3.8 25.1 4.9 29.6 5.7 9.8
50 to 99 lbs 38.4 2.1 33.4 2.6 22.7 2.0 21.1
100 to 499 lbs 27.0 5.3 33.1 6.4 37.6 5.4 10.0
500 to 749 lbs 47.0 2.0 42.4 1.4 S S 32.1
750 to 999 lbs S S S S S S 25.8
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 S S S S S S 26.4
Less than 50 lbs – – – – – – –
50 to 99 lbs S S S S S S 31.6
100 to 499 lbs S S S S S S 31.6
500 to 749 lbs S S S S S S 31.6
750 to 999 lbs – – – – – – –
1,000 to 9,999 lbs S S S S S S 29.8
10,000 to 49,999 lbs S S S S S S 29.9
50,000 to 99,999 lbs – – – – – – –
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 29.8 – 41.2 – S S 46.3
Less than 50 lbs 44.0 3.8 47.2 0.4 31.7 0.5 S
50 to 99 lbs S S S S S S S
100 to 499 lbs 39.2 4.7 27.3 2.3 S S 27.6
500 to 749 lbs 47.0 1.4 28.0 3.0 S S 29.6
750 to 999 lbs 49.3 0.5 41.9 0.5 44.1 0.2 S
1,000 to 9,999 lbs 38.1 10.6 43.8 10.7 S S 23.4
10,000 to 49,999 lbs 48.6 8.3 S S S S 41.7
50,000 to 99,999 lbs S S S S S S S
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.
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