The Performance of Seaport Clusters - RePub - Erasmus Universiteit ...
The Performance of Seaport Clusters - RePub - Erasmus Universiteit ...
The Performance of Seaport Clusters - RePub - Erasmus Universiteit ...
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10 STRUCTURE AND PERFORMANCE IN SEAPORT<br />
CLUSTERS; RESULTS OF THE CASE STUDIES<br />
In this chapter the effects <strong>of</strong> agglomeration economies, internal competition, cluster barriers<br />
and heterogeneity are discussed, each in one paragraph. <strong>The</strong> survey results are given in a<br />
series <strong>of</strong> tables, each presented in the same way. Two calculations to analyze the statistical<br />
significance <strong>of</strong> these results are used:<br />
• A calculation <strong>of</strong> the significance <strong>of</strong> expert opinions. For instance, only when a relatively<br />
large majority <strong>of</strong> experts agrees or disagrees with a proposition, can their judgment be<br />
safely claimed to be the common ‘expert opinion’. <strong>The</strong> ‘one sample T-test’ can be used<br />
to calculate the significance <strong>of</strong> these survey results. In general, results will be taken to<br />
be significant when the majority that agrees or disagrees is so large that the chance that<br />
these results are a ‘coincidence’ (when more experts would have been surveyed the<br />
results would not hold) is lower than 5% 81 . This test is done for the overall ‘expert<br />
opinion’ and for the three particular cases.<br />
• An analysis <strong>of</strong> the significance <strong>of</strong> the differences <strong>of</strong> results between the cases. <strong>The</strong><br />
significance <strong>of</strong> these differences can be analyzed by an ‘independent samples test’.<br />
This test determines whether differences between the cases are significant in the sense<br />
that the chance that they are a ‘coincidence’ is lower than 5%. This test only yields<br />
relevant results when it can be assumed that the experts in the three cases have the<br />
same reference point. In general this is the case, but the judgment <strong>of</strong> the quality <strong>of</strong> trust<br />
for instance, experts are likely to have different (nation specific) reference points. For<br />
the agree/disagree questions and the rating questions experts do have the same<br />
reference point, since these questions deal specifically with port clusters.<br />
<strong>The</strong> propositions in the table are given in their general form (‘the port cluster’). <strong>The</strong><br />
respondents answered the questions specifically for ‘their’ port cluster (for instance<br />
81 With regard to the propositions, the ‘average response’ <strong>of</strong> the experts is compared with an<br />
outcome where half <strong>of</strong> the experts agree and the other half disagrees.