 Usage:  y = sfvonmw(coeff,covu,di,ord,t)  
 
 Input:

  coeff                  matrix, estimated coefficients 
                         
  covu                   matrix, covariance 
                         
  di                     integer, dimension of time series 
                         
  ord                    integer, order of series 
                         
  t                      integer, number of observation time points 
                         
 Output:

  y                      matrix of standard errors for mean 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
