Journal of Shipping and Trade

Table 5 Results of robustness tests

From: Market access and seaport efficiency: the case of container handling in Norway

	Harris measures
	Orig	Rob. test	Orig	Rob. test
Harris fl	− 0.030***	− 0.029***	− 0.050***	− 0.048***
Harris fl	(0.010)	(0.010)	(0.011)	(0.010)
Harris hl	0.002***	0.006***	0.002***	0.005***
Harris hl	(0.000)	(0.001)	(0.000)	(0.001)
Size effect fl		0.004		− 0.087
Size effect fl		(0.074)		(0.075)
Size effect hl		− 0.003		0.002
Size effect hl		(0.005)		(0.005)
Other controls^a	No	No	Yes	Yes
N	224	224	224	224

Orig. refers to models without port size interaction effects, while Rob. test refers to models with port size interaction effects. Standard errors in parentheses. Significance levels: *p < 0.10; **p < 0.05; ***p < 0.01
^aOther controls here refer to time trend and quarter dummies

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