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

estimated was the same for all three categories. The general form
used was:
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log io Cost/EBM i = logioao + allogioEBMi + u2log10S i +i E l aiMi +
10 5
.EyR +ZAr.
313 ij k=1- k - ik
where: UM. = the number of equivalent barge miles produced each
S i
month
= firm size measured in total net tons of barge
carrying capacity
M. = monthly dummy variables (December excluded)
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R.. = percent of total EBM's produced oa river district j
3.3
in the ith month (Lower Mississippi excluded)
C ik = percent of total ton-miles carried of kth commodity
'group in the ith month (general cargo excluded)
The reasons for the Specification of the average cost function in a
log-linear form are given in Chapter IV.
As noted above, the measure of output used in the terminal
analysis was cargo tonnage. In the estimation of overhead costs
use of the monthly dummy variables resulted in an F-value for the
regression which was not significant at the .90 probability level.
Thus, the monthly dtimmy variables are excluded for the overhead
results.
C. The Results
Results for each cost category are presented in Tables 17 - 19.
Before examining the results, a general comment on the regressions is
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