 Usage:  rc = corr (x {,opt})  
 
 Input:

  x                      n x 2 matrix, the data. 
                         
  opt                    string, either "spearman" or "kendall". 
                         
 Output:

  rc                     rank correlation between the columns of x. 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
