Skip to main content

An Open Access Journal

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

0.15a

0.03

1.00

          

WT

0.05

0.05

0.08a

1.00

         

AN

−0.04

−0.01

0.03

0.00

1.00

        

GE

0.02

0.08a

0.05

−0.07a

−0.03

1.00

       

EN

−0.11a

0.04

0.10a

−0.04

−0.07a

0.06

1.00

      

NA

0.14a

−0.06

−0.02

0.01

−0.05

0.06

−0.08a

1.00

     

AC

0.13a

0.04

0.01

0.06

0.03

0.06

−0.11a

0.30a

1.00

    

TR

−0.45a

0.05

0.16a

0.10a

0.03

0.06

0.05

0.01

−0.01

1.00

   

PA

0.36a

−0.05

0.15a

0.10a

−0.01

0.01

−0.00

0.04

0.02

−0.24a

1.00

  

PB

0.20a

−0.06

−0.05

−0.03

0.02

−0.05

−0.08a

−0.00

0.22a

−0.25a

−0.38a

1.00

 

TS

0.05

−0.01

−0.06

−0.12a

−0.08a

0.05

0.06

0.10a

−0.05

−0.19a

−0.30a

−0.30a

1.00

JT

−0.36a

0.11a

−0.22a

−0.05

0.08

−0.06

−0.01

−0.19a

−0.11a

−0.15a

−0.23a

−0.24a

−0.18a

Y2000

−0.05

−0.08a

0.11a

−0.06

−0.03

0.01

0.08a

0.00

0.04

0.01

−0.01

−0.04

0.03

Y2001

−0.09a

0.00

−0.04

−0.01

0.03

0.03

−0.00

−0.10a

−0.08a

−0.02

−0.00

0.02

−0.01

Y2002

−0.07a

−0.08a

−0.01

0.07

0.01

−0.08a

−0.01

−0.01

−0.02

0.00

0.04

0.00

−0.04

Y2003

−0.07a

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

0.28a

0.13a

−0.04

−0.01

0.03

0.08a

−0.06

0.09a

0.04

−0.01

−0.06

0.02

0.06

  1. aIndicates correlation coefficients statistically significant at 5 % level or better