PEDUC							     ISCED97	   LIS recode
  0  missing/not asked								9
  1  1-6 years of education (primary)				1		1
  2  7-9 years of education (secondary lower)			2		1
  3  10-11 years of education (secondary higher)		3		2
  4  12 years of education (secondary higher)			3		2
  5  university level (tertiary)				5-6		3
  6  no schooling								1