 Usage:  {hcrit,crit}= regxbwsel(x {,h {,K} {} })  
 
 Input:

  x                      n x 2 vector, the data. 
                         
  h                      m x 1 vector, vector of bandwidths. 
                         
  K                      string, kernel function on [-1,1] or Gaussian 
                         kernel "gau". If not given, "qua" is used. 
                         
 Output:

  hcrit                  p x 1 vector, selected bandwidths by the 
                         different criteria. 
                         
  crit                   p x 1 string vector, criteria considered for bandwidth 
                         selection. 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
