Four-yearly Wage Structure Survey 
Sample errors
Main NCO-11 groups. National total
Unidades: %

All occupations;0,37;
A. Directors and managers;3,89;
B. Health and education-related scientific and intellectual technicians and professionals;1,82;
C. Other scientific and intellectual technicians and professionals;1,47;
D. Technicians, support professionals;1,07;
E. Office employees that do not provide customer service;1,37;
F. Office employees that provide customer service;1,96;
G. Workers in catering and trade services;1,49;
H. Workers in health and personal care services;1,62;
I. Workers in protection and security services;4,31;
J. Skilled agricultural, livestock, forestry and fishing sector workers;7,85;
K. Skilled construction workers, except machinery operators;1,83;
L. Skilled workers in the manufacturing industries, except installation and machinery operators;1,28;
M. Installation and fixed machinery operators and assemblers;1,55;
N. Mobile machinery drivers and operators;1,87;
O. Unskilled workers in services (except transport);1,42;
P. Agricultural, fishing, construction, manufacturing and transport industry labourers;1,88;
Notas:
Fuente: National Statistics Institute