Table 1 Correlation matrix for the T2-P90, BL, AL, AZH, and NAO.

From: The 2018 summer heatwaves over northwestern Europe and its extended-range prediction

 

Variables

BL

AL

AZH

NAO

Bivariate correlation coefficient between indices

AL

0.407**

   

AZH

0.469**

− 0.183

  

NAO

0.015

− 0.175

0.184

 

Bivariate correlation coefficient between T2-P90 and indices

SC(T2-P90)

0.803***

0.497***

0.392**

− 0.221

WE(T2-P90)

0.212

0.756***

− 0.165

− 0.234

Second-order partial correlation coefficient between indices

AL

0.563***

   

AZH

0.601***

− 0.442**

  

NAO

0.000

− 0.121

0.125

 

Third-order partial correlation coefficient betweenT2-P90 and indices

SC(T2-P90)

0.664***

0.352**

0.270*

− 0.390**

WE(T2-P90)

− 0.171

0.717***

0.091

− 0.156

  1. Numbers shown are the corresponding bivariate and second-order and third-order partial correlation coefficients. The second-order partial correlation coefficients are between two indices when all other two indices are held constant. The third-order partial correlation coefficients are between the T2-P90 over SC or WE and one of the indices when all other three indices are held constant. The correlation coefficients were calculated using Pearson method. The sample size is 62. The statistical significance is assessed with two-tailed Student’s t test, the p values that < 0.001, < 0.01, and < 0.05 are denoted by ***, **, and *.
Back to article page