Bureau of Transportation Statistics (BTS)
BTS Home > Publications > Commodity Flow Survey > States > Iowa
Printable Version

Table B–18 - Estimated Measures of Reliability for Shipment Characteristics by Two-Digit Commodity and Shipment Size for State of Origin: 2002

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

Excel | CSV

All Commodities

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 5.9 – 13.6 – 39.2 – 15.7
Less than 50 lbs 26.2 1.6 20.9 – 15.8 – 21.8
50 to 99 lbs 13.7 0.3 20.4 – 16.0 – 23.9
100 to 499 lbs 13.7 0.8 18.9 0.2 14.3 – 26.3
500 to 749 lbs 11.2 0.2 12.4 – 12.4 – 20.4
750 to 999 lbs 14.3 0.2 22.6 – 15.2 – 20.0
1,000 to 9,999 lbs 7.0 0.8 22.7 1.0 9.4 0.5 17.7
10,000 to 49,999 lbs 8.9 2.4 8.6 4.1 13.0 5.2 8.0
50,000 to 99,999 lbs 13.1 0.8 21.0 4.0 14.5 1.0 28.7
100,000 lbs or more 17.8 1.2 33.2 4.3 S S 12.3

SCTG 1, Live animals and live fish

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 31.6
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 31.6
10,000 to 49,999 lbs – – – – – – –
50,000 to 99,999 lbs – – – – – – –
100,000 lbs or more – – – – – – –

SCTG 2, Cereal grains

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 47.4 – 46.0 – S S S
Less than 50 lbs S S S S S S 28.0
50 to 99 lbs S S S S S S S
100 to 499 lbs S S S S S S S
500 to 749 lbs S S S S S S 38.7
750 to 999 lbs S S S S S S 31.6
1,000 to 9,999 lbs S S S S 48.7 – S
10,000 to 49,999 lbs S S S S S S S
50,000 to 99,999 lbs S S S S S S S
100,000 lbs or more S S S S S S S

SCTG 3, Other agricultural products

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 22.5 – 28.1 – 30.3 – 26.8
Less than 50 lbs S S S S S S 25.8
50 to 99 lbs S S S S S S 28.6
100 to 499 lbs S S S S S S 31.8
500 to 749 lbs S S S S S S 39.3
750 to 999 lbs 42.9 0.2 S S 50.0 – S
1,000 to 9,999 lbs S S S S 37.1 0.2 S
10,000 to 49,999 lbs S S S S S S S
50,000 to 99,999 lbs 42.6 12.3 41.2 14.0 40.6 2.5 23.9
100,000 lbs or more 27.8 13.5 30.8 13.7 32.4 2.7 8.1

SCTG 4, Animal feed and products of animal origin, nec

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 19.0 – 27.9 – 20.2 – S
Less than 50 lbs S S 45.8 – S S 35.0
50 to 99 lbs 28.6 – S S 35.0 – S
100 to 499 lbs S S 47.6 – 47.1 – S
500 to 749 lbs 46.9 0.2 42.4 – 49.0 – S
750 to 999 lbs S S S S S S S
1,000 to 9,999 lbs 37.9 4.7 S S 30.2 0.3 S
10,000 to 49,999 lbs 26.3 8.4 37.9 7.8 43.0 7.5 S
50,000 to 99,999 lbs 11.4 2.7 11.3 4.2 11.0 1.1 8.6
100,000 lbs or more 18.4 5.5 18.4 5.8 23.0 7.1 5.0

SCTG 5, Meat, fish, seafood, and their preparations

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 44.6 – 48.6 – S S 14.0
Less than 50 lbs S S S S S S S
50 to 99 lbs S S S S S S S
100 to 499 lbs 37.4 0.2 36.6 0.2 35.5 – 24.4
500 to 749 lbs 39.2 0.2 36.0 0.1 43.9 – 25.2
750 to 999 lbs 45.7 0.1 48.8 0.1 42.3 – 30.7
1,000 to 9,999 lbs 29.4 4.6 35.9 2.9 35.9 2.3 17.5
10,000 to 49,999 lbs 48.6 4.5 S S S S 4.8
50,000 to 99,999 lbs 40.0 1.1 37.6 1.5 45.0 1.5 25.2
100,000 lbs or more S S S S 49.8 1.9 29.8

SCTG 6, Milled grain products and preparations, and bakery products

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 19.2 – 22.2 – 30.7 – 16.4
Less than 50 lbs S S S S S S 31.7
50 to 99 lbs S S S S S S 30.0
100 to 499 lbs S S S S S S 28.9
500 to 749 lbs S S S S S S 31.6
750 to 999 lbs S S S S S S 30.9
1,000 to 9,999 lbs 32.3 0.8 37.7 0.3 S S 29.7
10,000 to 49,999 lbs 21.5 9.0 22.9 7.5 35.6 10.2 16.4
50,000 to 99,999 lbs 40.7 2.6 32.6 1.3 30.9 1.5 40.3
100,000 lbs or more 27.6 5.3 27.6 6.7 30.3 9.7 19.3

SCTG 7, Other prepared foodstuffs and fats and oils

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 31.9 – 32.8 – 28.4 – 19.4
Less than 50 lbs S S S S S S 30.3
50 to 99 lbs S S 45.8 – S S 33.3
100 to 499 lbs S S 47.9 – S S 32.7
500 to 749 lbs 34.1 0.2 33.0 – 44.1 – 38.0
750 to 999 lbs 42.3 0.3 44.4 – S S S
1,000 to 9,999 lbs 46.9 1.3 41.4 0.4 S S 22.9
10,000 to 49,999 lbs 42.4 7.4 47.9 5.0 S S 15.9
50,000 to 99,999 lbs S S S S 36.3 1.6 48.3
100,000 lbs or more 18.3 5.8 16.5 7.1 16.1 6.3 3.1

SCTG 8, Alcoholic beverages

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 25.6 – 25.6 – 36.1 – 29.7
Less than 50 lbs S S 45.0 0.3 37.9 0.5 34.2
50 to 99 lbs S S 35.7 0.6 28.4 0.7 S
100 to 499 lbs 38.6 2.4 47.9 1.3 40.4 3.7 15.5
500 to 749 lbs 43.8 1.1 48.1 1.4 S S 22.0
750 to 999 lbs 42.7 1.2 49.0 1.7 41.5 1.8 27.2
1,000 to 9,999 lbs 37.3 8.3 37.0 12.5 39.3 14.4 13.1
10,000 to 49,999 lbs 34.0 2.6 34.8 3.9 S S 35.7
50,000 to 99,999 lbs 31.8 2.3 31.9 3.8 32.4 0.9 22.9
100,000 lbs or more 37.8 12.8 30.2 13.8 37.4 19.5 24.2

SCTG 9, Tobacco products

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 – – – – – – –

SCTG 10, Monumental or building stone

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 – – – – – – –

SCTG 11, Natural sands

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 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 30.4
10,000 to 49,999 lbs S S S S S S 25.9
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

SCTG 12, Gravel and crushed stone

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 – 29.9 – S S 20.1
Less than 50 lbs – – – – – – –
50 to 99 lbs – – – – – – –
100 to 499 lbs S S S S S S 30.0
500 to 749 lbs S S S S S S 31.6
750 to 999 lbs S S S S S S 31.6
1,000 to 9,999 lbs 31.0 0.7 31.1 0.5 29.4 0.4 S
10,000 to 49,999 lbs 14.2 6.7 16.7 7.2 S S 34.0
50,000 to 99,999 lbs 40.9 6.9 S S 37.3 5.6 S
100,000 lbs or more S S S S S S 26.2

SCTG 13, Nonmetallic minerals nec

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 49.0
100 to 499 lbs 42.4 10.5 S S S S S
500 to 749 lbs S S S S S S 28.5
750 to 999 lbs S S S S S S 31.6
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 26.8
50,000 to 99,999 lbs S S S S S S S
100,000 lbs or more S S S S S S 31.6

SCTG 14, Metallic ores and concentrates

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 31.6
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 31.6
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 – – – – – – –

SCTG 15, Coal

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 27.9
Less than 50 lbs – – – – – – –
50 to 99 lbs – – – – – – –
100 to 499 lbs – – – – – – –
500 to 749 lbs – – – – – – –
750 to 999 lbs – – – – – –