European Transport Research Review

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Table 4 Pairwise correlation matrix of the explanatory variables

From: Citation counts in transportation research

	JT	Y₂₀₀₀	Y₂₀₀₁	Y₂₀₀₂	Y₂₀₀₃	Y₂₀₀₄
JT	1.00
Y₂₀₀₀	0.02	1.00
Y₂₀₀₁	0.02	−0.23^a	1.00
Y₂₀₀₂	−0.01	−0.24^a	−0.26^a	1.00
Y₂₀₀₃	−0.02	−0.24^a	−0.25^a	−0.27^a	1.00
Y₂₀₀₄	−0.01	−0.23^a	−0.25^a	−0.27^a	−0.26^a	1.00

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

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