Skip to main content

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