 Usage:  z=prognos2(f,yh,zt,hh)  
 
 Input:

  f                      matrix 
                         
  yh                     matrix, forecasts of variables 
                         
  zt                     vector, last observation of series 
                         
  hh                     scalar, forecast horizon 
                         
 Output:

  z                      matrix 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
