PEDUC							     ISCED97	   LIS recode
  1  illiterate									1
  2  without formal education							1
  3  basic education								1
  4  primary education						1		1
  5  secondary education					3A		2
  6  university preparation course				3A		2
  7  basic technical education							2
  8  advanced technical								3
  9  basic university						5		3
 10  advanced university					6		3

REMARK about recoding :
There is an unlikely high percentage of low educated, 
 this seems corresponding to reality though.
Code 5 (secondary education) is to be interpreted as upper secondary cycle 
 under the old Spanish educational system.