PEDUC							     ISCED97	   LIS recode
  0  no ecucation								1
  1  primary incomplete								1
  2  primary complete								1
  3  2° secondary incomplete 							1
  4  3° secondary complete							1
  5  preparatory, vocational or normal incomplete				1
  6  preparatory, vocational or normal complete					2
  7  superior incomplete							2
  8  superior complete								3
  9  postgraduate								3