Table 4. Necessity of ensuring normality...

Table 4.

Necessity of ensuring normality of the bulk shipbuilding forecasting variables through log transformation [based on monthly ‘testing data set’ (2008-2015)]

Test → ↓ Variables	Kolmogorov–Smirnov^a			Shapiro–Wilk
Test → ↓ Variables	Statistics	df	Sig.	Statistics	df	Sig.
Sb_OB	0.118	96	0.002	0.922	96	0.000
Log of Sb_OB	0.068	96	0.200*	0.974	96	0.054
B_fr	0.193	96	0.000	0.767	96	0.000
Log of B_fr	0.085	96	0.083	0.980	96	0.159
B_fp	0.207	96	0.000	0.721	96	0.000
Log of B_fp	0.061	96	0.200*	0.980	96	0.153
dB_sq	0.151	96	0.000	0.877	96	0.000
Log of dB_sq	0.050	96	0.200*	0.981	96	0.170

Test →↓ Variables	Kolmogorov–Smirnov^a			Shapiro–Wilk
Test →↓ Variables	Statistics	df	Sig.	Statistics	df	Sig.
Sb_OB	0.118	96	0.002	0.922	96	0.000
Log of Sb_OB	0.068	96	0.200*	0.974	96	0.054
B_fr	0.193	96	0.000	0.767	96	0.000
Log of B_fr	0.085	96	0.083	0.980	96	0.159
B_fp	0.207	96	0.000	0.721	96	0.000
Log of B_fp	0.061	96	0.200*	0.980	96	0.153
dB_sq	0.151	96	0.000	0.877	96	0.000
Log of dB_sq	0.050	96	0.200*	0.981	96	0.170

Notes:

^aLilliefors Significance Correction.

*This is a lower bound of the true significance

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