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2010. 5. 10

Post Enumeration Survey for Population Census

Jaewon LeeStatistical Research Institute

Statistics Korea

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PES has been conducted on every 5 years

PES period : 12. 1. ~ 8. (8 days)

- Census period : November 1. ~ 15.

Sample size : 730 enumeration areas

- 0.27% of total enumeration areas

No. of questions : 15 questions

Data collection method : Face to face interview

Outline of the

2005 PES

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to estimate coverage errors of the population census

to evaluate the quality of answers by measuring levels of

agreements between census and PES answers

to improve planning and operations of the census by characterizing missed and erroneously included individuals

to produce information for population, households projection

Objectives of PES

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Organizational

structurePES

Vital Statistics Div. Population Census Div.

Local Office Local Government

Census

PlanningPlanning

Field Management

Field Management

* Trends Analysis Div. in the Statistical Research Institute (2010)

* Trends Analysis Div. in the Statistical Research Institute (2010)

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Enumerators of PES : Well- trained field staff in the local

office of Statistics Korea (730 people)

Enumerators of the Census : temporary hired people during census-taking periods (105,000 people)

Benefits of using field staff in the local office

Extensive experience in field survey

Produce high quality survey data

Criteria for selection : experience in data collection for household survey

Recruiting for enumerators

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Sample size : 0.27% (730 enumeration areas)

60 households per one enumeration area

Sample size of provinces were allocated using standard errors in 2000 PES and compromise allocation methods

Sampling frame : list of census enumeration areas

Sampling methods

Stratified by the type of enumeration area Proportionate probability sampling within a stratified list of

census enumeration area

Analysis domains : national and province

Sampling design

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Census Dependent re-enumeration (single system)

Information provided to PES enumerators

Census map

Household list

Basic information for household members : name, gender, age,

marital status, relationship to the head of the household

Enumerators duties

Identify/probe all households in an EA boundary

Face to face interview

Persuade interview refusals

Field Work

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Questions for PES

Question for individuals Name, gender, age, marital status, relationship to the head of

the households

Date moved to the current address, type of individuals (non-

mover, in-mover, out-mover, erroneously included, omitted),

reason for omission, reason for erroneous inclusion, previous

address of in-mover

Question for households Types of household, reason for omission, reason for erroneous

inclusion, house types

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Coverage errors in PES

1995 2000 2005

Net coverage error (%)

1.25 1.56 0.90

Omission rates(%) 3.06 3.30 2.39

Erroneous inclusion rates (%)

1.81 1.74 1.49

Gross coverage error 4.87 5.04 3.88

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Use of PES results

Adjust the base population of the population projection by

coverage errors

Adjust the base household numbers for the households

projection

Improve future census planning and operations

Evaluate census coverage errors

Evaluate quality of answers

Census figures were not adjusted by PES results

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General directions for 2010

PES Expand sample size from 730 EAs to 3,000 EAs

Estimate coverage errors to the city and county level

(nation, province, city/county)

Intensify independence of PES from the census

Produce information to evaluate the registered population

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Thank YouThank You