 Usage:  coeff = coeffest(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, adjusted (1) or not (0) 
                         
  typ                    integer, describing the model type 
                         
  ytt                    vector, the transformed time series 
                         
 Output:

  coeff                  matrix, the estimated coefficients 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
