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

Footnotes--Continued
commodity.
2. The amount of cargo in a barge. There is an empty barge weight
for each river district. A simple formula is given for interpolating
the weights for loads between empty and completely full.
The formula makes the EBM weight of any specific load a linear
function of the draft of the vessel.
No detailed account is given of the derivation of the weights.
. They were apparently taken from tank tests made at the University of
Michigan by Professor L. A. Baler and from individual carrier experience.
CHAPTER III
1H owe, Water Resources Research, I, No. 1 (1965), 25-39, and Howe,
"Process and Production Functions , . ," January, 1964.
2 A. A. Walters, "Production and Cost Functions: An Econometric.
Survey," Econometrica, XXI (Jan.-April, 1963), 1-66.
3 It is assumed that other parameters of the production function remain
the same across all River Districts. -Thus, the river district
dummy variables represent a shift in the whole production surface.
4See: J. Johnston, Econometric Methods (NeW York: McGraw Hill,
1963), pp. 136-138.
5For a discussion of technological change see: Lester B. Lave,
Technological Change: Its Conception and Measurements (Englewood Cliffs:
Prentice Hall, 1966).
Chap. 4. This can be compared to an overall rate of technological
change in manufacturing of.about 2 1/2% per year.
CHAPTER IV
. .
IA river district is a stretch of the waterway system which has
roughly the same characteristics (depth, width, and stream flow) over
its length. All of the firms in the sample collect information on
their operations by river district (ton-miles produced, towboat hours
of operation, etc.) This information is taken from the towboat logs
that a, captain keeps for each boat. Fortunately, the definition of
the various river districts (about 27 in all) is, with one exception,
the same for all the firms. The same definitions are found also in
Interstate Commerce Commission literature about the baige industry
(See I.C.C. Barge Form C).
154