Four-yearly Wage Structure Survey 
Sample errors
Studies completed. National total 
Unidades: %

All studies,0,37,
I. Without studies,3,9,
II. Primary education,1,43,
III. Secondary education I,0,9,
IV. Secondary education II,1,35,
V. Intermediate-level vocational training,1,39,
VI. Advanced vocational training,1,32,
VII. University diploma-holders or the equivalent,1,39,
VIII. University graduates, advanced engineers and doctors,1,37,
Notas:
Fuente: National Statistics Institute