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Encuesta Nacional de Estratificación Social (septiembre 2009)



This survey aims to provide information on the way in which Chilean society is structured, based on classical and non-conventional variables. Data recollection (field work) lasted  10 weeks, from the 29th of May, to the 9th of August 2009. . Survey was applied by Statcom Ltda., on a face to face basis, in the 15 regions of the country.

It contained the following modules:

Section1: Social and territorial identification

Section 2: Religion and traveling

Section 3: Labor

Section 4: Heritage

Section 5: Education

Section 6: Social mobility

Section 7: Social capital

Section 8: Political position and participation

Section 9: Values

Section 10: Personal & familiar demographic variables

Section 11: Housing and residence (family record)

Section 12: Income (family record)

Note: The results of the project are not available to the public. As a scientific-academic project, containing a national survey with more than 100 questions and 350 variables, the research team shall exhaust data-analysis (maintaining privacy and exclusivity) up to the termination of the Project (March 2012). On that date, the database will be available for public in general. In regard to the analysis and processing of data, as much as the research team publishes in scientific journals, or press articles and public presentation of the results. Final outcomes and conclusions shall be also available on our website.


Survey’s universe and regional representation

The study’s universe corresponds to people over 18, all residents in Chilean territory, which reaches 11.965.990 people, according to INE (National Institute of Statistics) (projections 30/06/2008).

Design considered including rural areas, small and main regional cities.

Sample design and characteristics

Sample design used corresponds to one stratified by conglomerates in three stages: Elementary Sampling Unit (UMP) Square/entity (according to INE definition Square/entity corresponds to housing in rural-urban areas); Secondary Sample Unit (UMS): home (by INE´s definition:  group of people who live in the same dwelling and cooked their meals together) and Tertiary Sampling Unit (UMT); persons of 18 years and over.

The sample framework used for the selection of the UMP, corresponds to the 2002 database census with update sectors in large cities. Basic cartographic material for identification of the UMP was INE maps.

Selection was made through a computer system (software) designed for this purpose, to ensure randomness to the process.

Each sorted UMP compile existing homes and 5 households were randomly selected. In each household is interviewed firstly the person that provides the primary household income or his spouse, who completed an hour interview, responding the Household (Home) Card (General home data; number and characteristics of its members, education, income, occupation, household goods), and the individual survey (social networks, citizenship and political participation, values and religion, social and territorial identity). Remaining household members over 18 years responded only individual survey.

The sample was stratified by regions and urban-rural areas, using fixed allocation dwelling.

Sample size

The final sample size in homes was 3,365 cases (UMS), who’s maximum sampling error considering maximum variance, a 95% confidence level, and an estimated 0.9 design effect (deff); at the national level is 1.6%, reaching to Metropolitan Region (Greater Santiago) 4.0%; and for each of the regions varies among the rest of the regions an average of 7.2%.

The final sample size for people was 6,153 cases whose maximum sampling error considering maximum variance, a 95% confidence level, and an estimated design effect of 1.15 to a national level is 1.3%, ; for the metropolitan region reaching an estimated error of 3.6% and for the rest of the regions an average of 5.7%.

Technical documentation of the survey (in Spanish) : Download here.