PEDUC							     ISCED97	   LIS recode
  0  unknown level								9
  2  compulsory less than 9 years						1
  3  9 years compulsory								1
  4  less than 3 years secondary						2
  5  3 or more years secondary							2
  6  less than 3 years post-secondary						3
  7  3 or more years post-secondary						3
  8  post graduate education							3