PEDUC                                 				ISCED97       LIS recode
 1  none                            		        			   1
 2  elementary school				                   1	           1
 3  middle school                        			   2A         	   1
 4  professional secondary school diploma - 3 years of study       3C              2  
 5  high school                        				   3A-3B           2
 6  associate's degree or other short university degree            5A-5B           3
 7  bachelors degree                        			   5A-5B           3
 8  post graduate qualification                			   6        	   3