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Table 3 Pairwise correlation matrix of the explanatory variables

From: Citation counts in transportation research

	KW	RF	WA	WT	AN	GE	EN	NA	AC	TR	PA	PB	TS
KW	1.00
RF	0.00	1.00
WA	0.15^a	0.03	1.00
WT	0.05	0.05	0.08^a	1.00
AN	−0.04	−0.01	0.03	0.00	1.00
GE	0.02	0.08^a	0.05	−0.07^a	−0.03	1.00
EN	−0.11^a	0.04	0.10^a	−0.04	−0.07^a	0.06	1.00
NA	0.14^a	−0.06	−0.02	0.01	−0.05	0.06	−0.08^a	1.00
AC	0.13^a	0.04	0.01	0.06	0.03	0.06	−0.11^a	0.30^a	1.00
TR	−0.45^a	0.05	0.16^a	0.10^a	0.03	0.06	0.05	0.01	−0.01	1.00
PA	0.36^a	−0.05	0.15^a	0.10^a	−0.01	0.01	−0.00	0.04	0.02	−0.24^a	1.00
PB	0.20^a	−0.06	−0.05	−0.03	0.02	−0.05	−0.08^a	−0.00	0.22^a	−0.25^a	−0.38^a	1.00
TS	0.05	−0.01	−0.06	−0.12^a	−0.08^a	0.05	0.06	0.10^a	−0.05	−0.19^a	−0.30^a	−0.30^a	1.00
JT	−0.36^a	0.11^a	−0.22^a	−0.05	0.08	−0.06	−0.01	−0.19^a	−0.11^a	−0.15^a	−0.23^a	−0.24^a	−0.18^a
Y₂₀₀₀	−0.05	−0.08^a	0.11^a	−0.06	−0.03	0.01	0.08^a	0.00	0.04	0.01	−0.01	−0.04	0.03
Y₂₀₀₁	−0.09^a	0.00	−0.04	−0.01	0.03	0.03	−0.00	−0.10^a	−0.08^a	−0.02	−0.00	0.02	−0.01
Y₂₀₀₂	−0.07^a	−0.08^a	−0.01	0.07	0.01	−0.08^a	−0.01	−0.01	−0.02	0.00	0.04	0.00	−0.04
Y₂₀₀₃	−0.07^a	0.03	−0.02	0.01	−0.05	−0.05	−0.00	0.01	0.02	0.02	0.03	−0.00	−0.03
Y₂₀₀₄	0.28^a	0.13^a	−0.04	−0.01	0.03	0.08^a	−0.06	0.09^a	0.04	−0.01	−0.06	0.02	0.06

^aIndicates correlation coefficients statistically significant at 5 % level or better

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