Perform r-to-Z transform to get significance of difference between two correlation coefficients
| 1 | cor.diff(r1, n1, r2, n2)
 | 
| r1 | correlation coefficient of the first correlation | 
| n1 | number of observations in the first correlation | 
| r2 | correlation coefficient of the second correlation | 
| n2 | number of observations in the second correlation | 
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