 Usage:  omega=omerrgen(coeff,phi,sigma,h,t,ord,di,tb,te,adj,typ,ytt)  
 
 Input:

  coeff                  matrix, the coefficients 
                         
  phi                    matrix, 
                         
  sigma                  vector, standard error 
                         
  h                      integer, forecast horizon 
                         
  t                      integer 
                         
  ord                    integer, order of series 
                         
  di                     integer, dimension of time series 
                         
  tb                     integer, (time) begin 
                         
  te                     integer, (time) end 
                         
  adj                    scalar, 1=if adjusted, 0=if not 
                         
  typ                    integer, describing the model type 
                         
  ytt                    matrix, the time series 
                         
 Output:

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