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Table 9 Analysis of residual for Norway

From: Short sea shipping: a statistical analysis of influencing factors on SSS in European countries

Total SSS volume
Variables Value Coefficient ΔSSS volume
Constant   −0.532 0
Number of Large SSS Ports [port] 4 16.877 67.5
GDP per Head [1000 euro] 78.050 1.419 110.8
Estimated total SSS volume [million ton] 178.3
Observed total SSS volume [million ton] 147.4
Residual/SSS Potential [million ton] 30.9