 Usage:  rel = relationcorr (x {, colname {, opt})  
 
 Input:

  x                      n x p variables 
                         
  colname                p x 1 text vector of names of x variables 
                         
  opt                    q x 1 text vector of optional parameters 
                         
 Output:

  rel.r                  p x p matrix of correlation coefficients 
                         
  rel.pval               p x p pvalue of t-statistic (r=0) 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
