 Usage:  covf=covforec(a,cova,covu,ord,adj,tb,te,h,typ,ytt)  
 
 Input:

  a                      matrix, parameters 
                         
  cova                   matrix, covariance matrix of parameters 
                         
  covu                   matrix, covariance matrix of residuals 
                         
  ord                    vector, order of series 
                         
  adj                    scalar, 1=if adjusted, 0=if not 
                         
  tb                     integer, (time) begin 
                         
  te                     integer, (time) end 
                         
  h                      integer, forecast horizon 
                         
  typ                    integer, indicating the model type 
                         
  ytt                    vector, the transformed time series 
                         
 Output:

  covf                   matrix, forecast MSE 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
