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Table 3 SSS univariate regression analyses and correlations

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

Dependent variables Independent variables
Land area Coastline Coast/Area ratio Total number of SSS ports Number of small SSS ports Number of large SSS ports Number of inhabitants GDP GDP per head Length of road network Length of rail network Length of inland waterway network
Total SSS Volume R 2 0.346 0.166 0.065 0.645 0.444 0.748 0.554 0.552 0.128 0.529 0.274 0.081
Corr. Coeff. 0.588 0.407 −0.254 0.803 0.666 0.865 0.744 0.722 0.357 0.727 0.523 0.285
Corr. Sig. 0.002 0.044 0.220 0.000 0.000 0.000 0.000 0.000 0.080 0.000 0.007 0.167
Liquid Bulk SSS Volume R 2 0.220 0.148 0.048 0.537 0.355 0.661 0.379 0.410 0.127 0.295 0.186 0.084
Corr. Coeff. 0.469 0.385 −0.219 0.733 0.596 0.813 0.616 0.640 0.357 0.543 0.432 0.290
Corr. Sig. 0.018 0.057 0.294 0.000 0.002 0.000 0.001 0.001 0.080 0.005 0.031 0.159
Dry Bulk SSS Volume R 2 0.499 0.240 0.061 0.377 0.264 0.426 0.486 0.292 0.101 0.445 0.176 0.030
Corr. Coeff. 0.706 0.490 −0.247 0.614 0.514 0.652 0.697 0.540 0.317 0.667 0.419 0.174
Corr. Sig. 0.000 0.013 0.233 0.001 0.009 0.000 0.000 0.005 0.122 0.000 0.037 0.405
RO-RO Units SSS Volume R 2 0.090 0.095 0.020 0.666 0.561 0.546 0.317 0.493 0.117 0.508 0.255 0.034
Corr. Coeff. 0.301 0.308 −0.141 0.816 0.749 0.739 0.563 0.702 0.341 0.713 0.505 0.184
Corr. Sig. 0.144 0.135 0.500 0.000 0.000 0.000 0.003 0.000 0.095 0.000 0.010 0.379
Containers SSS Volume R 2 0.294 0.014 0.060 0.251 0.122 0.445 0.536 0.355 0.007 0.509 0.225 0.064
Corr. Coeff. 0.543 0.118 −0.246 0.501 0.349 0.667 0.732 0.595 0.081 0.713 0.474 0.253
Corr. Sig. 0.005 0.573 0.236 0.011 0.087 0.000 0.000 0.002 0.700 0.000 0.017 0.222
  1. The R2 rows show the values for the univariate regression lines with the independent variable as the single predictor of the dependent variable