PEDUC							     ISCED97	   LIS recode
  1  university									3
  2  incomplete university							2
  3  post-secondary								2
  4  complete secondary								2
  5  incomplete secondary							1
  6  basic vocational								2
  7  complete elementary							1
  8  incomplete elementary							1
  9  self-taught, illiterate, pre-school children				1
 10  elementary school students							9
 11  basic vocational school students 						9
 12  secondary school students							9
 13  secondary vocational school students					9
 14  post-secondary school students						9
 15  university students							9