Four-yearly Wage Structure Survey 
Sample errors
Variation coefficients for the gross annual earnings by studies
Units: %

All studies	0.45	
I. Without studies	1.42	
II. Primary education	1.43	
III. Secondary education I	0.72	
IV. Secondary education II	1.34	
V. Intermediate vocational training	1.03	
VI. Advanced level vocational training	0.91	
VII. University diploma or equivalent	1.67	
VIII. University graduates, advanced engineers and doctors	1.13	
Notes:
Source: National Statistics Institute