 Usage:  {y, ew2} = estabr(ord,rang,di,tb,te,typ,ytt)  
 
 Input:

  ord                    integer, order of series 
                         
  rang                   matrix 
                         
  di                     integer, dimension of time series 
                         
  tb                     integer, (time) begin 
                         
  te                     integer, (time) end 
                         
  typ                    integer, describing the model type 
                         
  ytt                    vector, the transformed time series 
                         
 Output:

  y                      matrix of parameters a and b 
                         
  ew2                    matrix of eigenvalues 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
