 Usage:  test = lvtest(y,w,z,hw,hz)  
 
 Input:

  y                      n dimensional vector 
                         
  w                      n x p matrix 
                         
  z                      n x k matrix 
                         
  hw                     p1 dimensional vector 
                         
  hz                     k dimensional vector 
                         
 Output:

  test                   test statistic and its P-value 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
