PEDUC							     ISCED97	   LIS recode

  1  less than first stage of secondary level					1
  2  first stage of secondary level (general)					1
  3  first stage of secondary level (arts)					1
  4  first stage of secondary level (technical)					1
  5  first stage of secondary level (vocational					1
  6  second stage of secondary level (general)					2
  7  second stage of secondary level (arts)					2
  8  second stage of secondary level (technical)				2
  9  second stage of secondary level (vocational)				2
 10  third level other than university degree					3
 11  initial university degree, or eqivalent					3
 12  higher university degree, or post-doctorate				3
 -1  not asked									9