 Usage:  (kp, critvalue) = kpssnum(y,T)  
 
 Input:

  y                      vector 
                         
  T                      scalar, truncation lag for the autocorrelation consistent variance estimator 
                         
 Output:

  kp                     vector 
                         
  critvalue              vector 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
