 Usage:  covr = covres(ord,di,tb,te,adj,typ,ytt)  
 
 Input:

  ord                    integer, order of series 
                         
  di                     integer, dimension of time series 
                         
  tb                     integer, (time) begin 
                         
  te                     integer, (time) end 
                         
  adj                    integer, 1=if adjusted, 0=if not 
                         
  typ                    integer, describing the model type 
                         
  ytt                    vector, the transformed time series 
                         
 Output:

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