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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 −0.23a 1.00    
Y2002 −0.01 −0.24a −0.26a 1.00   
Y2003 −0.02 −0.24a −0.25a −0.27a 1.00  
Y2004 −0.01 −0.23a −0.25a −0.27a −0.26a 1.00
  1. aIndicates correlation coefficients statistically significant at 5 % level or better