 Usage:  y = coeffba(di,ord,tb,te,covu,zz,a,la,th)  
 
 Input:

  di                     integer, dimension of time series 
                         
  ord                    integer, order of series 
                         
  tb                     integer, (time) begin 
                         
  te                     integer, (time) end 
                         
  covu                   matrix, covariance 
                         
  zz                     matrix 
                         
  a                      vector 
                         
  la                     vector 
                         
  th                     vector 
                         
  typ                    integer, model type 
                         
  ytt                    matrix, the time series 
                         
 Output:

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