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Q2 Z2,(Q2) Z2(Q2) - Institute for Water Resources - U.S. Army

Q2 Z2,(Q2) Z2(Q2) - Institute for Water Resources - U.S. Army

Q2 Z2,(Q2) Z2(Q2) - Institute for Water Resources - U.S. Army

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origins, and if the classification was always transitive, one could be<br />

satisfied by a probability greater than .333 to attribute a shipment<br />

point to a mode of transportation. Since the possibility of<br />

intransitivity is not excluded, one might set a level slightly higher<br />

be<strong>for</strong>e classifying an origin in a mode category.<br />

Both methods reach exactly the same classificatin of origins.<br />

If it is then wished to estimate the volume of shipments by each mode,<br />

one could <strong>for</strong> instance compute the sum of the tonnages shipped by all<br />

the origins in each class. Alternatively, one might regroup the origins<br />

per county and allocate each county production to the three modes in<br />

proportion to the number of shippers in each class.<br />

Finally, one could investigate the influence of variation in the<br />

market prices, the rates, the interest rate, and the time on the choices<br />

of mode.<br />

53

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