1. Active variables
   1. CODE_1
      1. Instit_1
      2. Instit_2
      3. Instit_n
   2. CODE_2
      1. Instit_1
      2. Instit_2
      3. Instit_n
   3. CODE_3
      1. Instit_1
      2. Instit_2
      3. Instit_n
2. Filters
   1. Period
      1. 1
      2. 2
      3. 3
      4. 4
      5. 5
   2. Generation
      1. 1
      2. 2
      3. 3
      4. 4
      5. 5
3. Supplementary variables
   1. Birth data (year, province)
      1. Year
      2. Province
      3. Generation
         1. 1
         2. 2
         3. 3
         4. 4
         5. 5
   2. Education (highest degree obtained)
      1. Country of education
      2. Educational institution
      3. Degree
      4. Discipline
   3. (Death data)
      1. Country
      2. Year
   4. Period
      1. 1
      2. 2
      3. 3
      4. 4
      5. 5
   5. Political affiliation (POL)
      1. POL_C
      2. POL_D
      3. POL_F