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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 10.8 – 14.9 – 16.7 – 24.6
Less than 50 lbs 19.6 3.1 29.5 – 31.0 0.2 24.2
50 to 99 lbs 29.5 0.7 S S 40.2 – S
100 to 499 lbs 13.8 1.1 32.4 0.2 19.2 0.2 39.5
500 to 749 lbs 31.7 0.8 30.0 – 22.9 0.1 18.1
750 to 999 lbs 22.2 0.6 25.7 – 21.1 0.1 23.0
1,000 to 9,999 lbs 24.1 3.7 14.4 0.8 15.5 3.0 13.4
10,000 to 49,999 lbs 10.4 2.6 22.0 4.1 19.8 4.7 28.8
50,000 to 99,999 lbs 18.5 1.5 14.5 4.1 14.8 2.3 20.3
100,000 lbs or more 46.3 0.3 S S 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 11.6 – 15.0 – 16.6 – 29.8
Less than 50 lbs 7.2 1.0 40.8 – 25.2 – S
50 to 99 lbs 37.2 0.8 S S 43.4 – S
100 to 499 lbs 15.2 1.5 33.6 0.2 16.0 0.2 31.9
500 to 749 lbs 35.1 0.9 31.0 – 22.3 0.1 20.0
750 to 999 lbs 23.4 0.6 27.7 – 24.1 0.1 15.1
1,000 to 9,999 lbs 24.5 3.6 14.5 0.8 15.5 3.1 13.8
10,000 to 49,999 lbs 10.3 2.7 22.0 4.1 19.7 4.7 28.9
50,000 to 99,999 lbs 19.2 1.8 14.5 4.1 15.0 2.3 20.6
100,000 lbs or more 44.9 0.4 S S 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 12.3 – 15.3 – 15.9 – 18.8
Less than 50 lbs 18.6 1.0 42.2 – 49.0 – 33.5
50 to 99 lbs 46.7 0.8 S S S S 32.2
100 to 499 lbs 14.9 1.5 34.2 0.2 18.6 0.2 22.9
500 to 749 lbs 35.2 1.0 30.9 – 21.8 0.1 20.5
750 to 999 lbs 23.1 0.6 27.7 – 24.3 0.1 15.4
1,000 to 9,999 lbs 24.8 3.7 14.6 0.8 15.6 3.0 13.7
10,000 to 49,999 lbs 10.1 2.8 22.0 4.0 19.9 4.5 29.4
50,000 to 99,999 lbs 19.2 2.0 14.5 4.1 14.9 2.5 20.6
100,000 lbs or more S S S S 43.0 0.3 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 S S S S S S S
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 S S S S S S 30.2
50,000 to 99,999 lbs – – – – – – –
100,000 lbs or more S S S S S S S

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 26.4 – 29.1 – 35.9 – 5.2
Less than 50 lbs 33.0 12.1 27.1 14.2 28.1 14.4 11.4
50 to 99 lbs S S 46.2 1.6 49.4 1.5 40.3
100 to 499 lbs 48.1 10.3 32.0 9.9 34.3 9.4 27.4
500 to 749 lbs S S S S S S 31.6
750 to 999 lbs S S S S S S 27.9
1,000 to 9,999 lbs S S 49.1 5.8 S S 26.6
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 20.3 – 25.0 – 42.9 – 13.5
Less than 50 lbs 27.9 7.4 28.5 8.8 35.6 7.4 13.1
50 to 99 lbs 22.9 2.1 30.5 4.1 46.4 3.7 18.0
100 to 499 lbs 29.4 5.9 32.7 3.9 S S 18.2
500 to 749 lbs 47.3 1.9 S S S S S
750 to 999 lbs S S S S S S S
1,000 to 9,999 lbs S S S S S S S
10,000 to 49,999 lbs S S S S S S 31.6
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 20.5 – 26.9 – 42.9 – 13.6
Less than 50 lbs 27.9 7.3 28.5 8.3 35.6 7.9 13.1
50 to 99 lbs 22.9 2.1 30.5 4.0 46.4 3.6 18.0
100 to 499 lbs 29.4 6.0 32.7 3.6 S S 18.2
500 to 749 lbs 47.3 1.9 S S S S S
750 to 999 lbs S S S S S S S
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 S
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 S S S
10,000 to 49,999 lbs S S S S S S 31.6
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 24.6 – 26.6 – 49.5 – S
Less than 50 lbs 41.7 6.6 44.6 1.6 46.2 2.3 S
50 to 99 lbs S S 36.9 1.4 32.5 0.6 S
100 to 499 lbs S S S S S S 25.3
500 to 749 lbs S S S S S S 28.4
750 to 999 lbs S S S S S S 29.9
1,000 to 9,999 lbs 38.8 13.6 48.3 15.1 S S S
10,000 to 49,999 lbs S S S S S S 31.1
50,000 to 99,999 lbs S S S S 47.1 10.8 29.1
100,000 lbs or more S S S S S S 28.5

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.
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