Open Access
Scientific Article

Table 5

Regression coefficients for curve fit by quadratic model without constant.

β1 Chi-Q. p β2 Chi-Q. p
Road −0.06479 35.631 0.000 0.00213 76.089 0.000
Rail −0.04685 33.458 0.000 0.00159 52.745 0.000
Air −0.02447 3.973 0.046 0.00219 25.978 0.000

Note: β1 = regression coefficient for the 1st order; β2 = regression coefficient for the 2nd order; Chi-Q. = Wald-Chi-Quadrat; p = significance level; p < 0.05 is marked in bold.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.