The signs of parameters for other inputs are consistent between Cobb-Douglas and Translog models and between the net effect and gross effect models. All are positive in both Cobb-Douglas and Translog models. The variables quay length, yard space and number of gantry cranes, as expected, have a positive sign, since bigger terminals are generally assumed to handle greater amounts of throughput. In contrast, the parameter max berth depth was expected to exhibit an unstable parameter sign. The reason for this presumption is that when berth depth exceeds the requirement for ships, it is not important if the water happens to be deeper. Berth depth in our data set ranges between 6.8 and 18 meters; fully loaded super-Panamax container ships have a draft of 12 meters (Post-Panamax containerships were launched in 2006 and their draft is 15.2 meters) and would be likely to encounter problems only in shallow water. However, the parameter for berth depth is positive in all the models, implying that the deep water feature of the terminals contributes to the attraction of container traffic. We next examine the obtained results in light of our hypotheses in order to verify their validity.