Transcript United Nations Regional Workshop on the 2010 World Programme on Population and Housing Censuses: Census Evaluation and Post Enumeration Surveys Bangkok, Thailand.

United Nations Regional Workshop on the 2010 World
Programme on Population and Housing Censuses: Census
Evaluation and Post Enumeration Surveys
Bangkok, Thailand. 10 – 14 May, 2010
2001 Post Enumeration Survey in
Sri Lanka
Department of Census & Statistics
Sri Lanka
REPUBLIC OF SRI LANKA
Sri Lanka
is an Island in the Indian Ocean
There are nine provinces and 25 Districts
OUT LINE
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Country overview.
History of Population Census in Sri Lanka
History of Post Enumeration Survey in Sri Lanka
Why do evaluate the Census
Method of Evaluation
Common source of errors
Independency of PES
Objectives of the PES
2001 PES Methodology
Sample design of PES
Matching operation and reconciliation
2001 PES Questions
Training of PES
PES report
Application of the PES results
2011 population and census : PES
2011 PES activities
2011 PES methodology
Indicators to be calculated
COUNTRY OVERVIEW
Area of Sri Lanka
Population (2008)
 Male
 Female
Average Population Density
Natural Rates of Population Increase
Life expectancy at Birth (2001)
 Male
 Female
Infant Mortality Rate (IMR) (2001))
Literacy Rate
 Male
 Female
65610 (sq. km.)
20.21 (million)
9.98 (million)
10.23 (million)
322 per sq km
1.1%
72 (Years)
76 (Years)
11 (per thousand live births)
91.1 %
92.6 %
89.7 %
HISTORY OF POPULATION CENSUS IN
SRI LANKA
Sri Lanka has a long history of Census taking. The first
census was conducted in 1871. Since then Censuses have been
conducted once in ten years with certain exceptions. The last
census was conducted in July 2001 and it is the 13th of the
series.
In Sri Lanka the method of enumeration has traditionally been
“defacto” basis. Department of Census & Statistics of Sri
Lanka hope to conduct next Population Census in July 2011
and type of enumeration will be “dejure”
HISTORY OF POST ENUMERATION SURVEY IN
SRI LANKA
The First Post Enumeration Survey (PES) was conducted in 1953 and the
last PES was conducted in 2001 it in the 3rd of the series.
The Post Enumeration Survey (PES) was conducted to achieve the
following goals;
1)To evaluate the coverage and content errors of Census results.
2)To estimate under enumeration and over enumeration
The results of 2001 PES are ready although it has not been published and
used for internal purposes the findings will be used in planning and
designing of future censuses.
WHY DO EVALUATE THE CENSUS
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As all other statistics, data collected through the
census include errors.
To provide users with measures of the quality of the
census data to help them to interpret the results.
To provide information on the magnitude of errors to
adjust the results.
METHODS OF EVALUATION USED BY
DEPARTMENT OF CENSUS AND
STATISTICS
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Comparison of Census statistical information with figures
from other sources.
Post Enumeration Survey (PES)
Internal consistency checks.
COMMON SOURCE OF ERRORS
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Coverage
- Omissions
- Duplications
Content
- Non- responses
- Influence responses
• Interview effect
• Respondent effect
INDEPENDANCY OF PES
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PES was done by an independent unit of the Department of Census
and Statistics
Enumerators of the census were temporary recruited staff.
Enumerators of the PES were permanent staff of the department
who did not engage in census activities in the same area of PES.
Census field staff did not have any knowledge of the areas which
were going to be in the sample for the PES
Before the commencement of PES field work, all the census
schedules were returned from the districts.
OBJECTIVES OF THE PES
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Measure both coverage and content errors in the results of census.
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Provides estimates to adjust census results, if necessary.
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Evaluate the completeness of Births and Deaths registration.
2001 PES METHODOLOGY
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Coverage : 450 randomly selected EA’s
No. of EA’s in the
PES sample
Colombo metropolitan
Urban
Rural
Estate
Total Sri Lanka
150
100
100
100
450
SAMPLE DESIGN OF PES
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Universe – population living in the households were
numerated, population living in the institutions
were excluded.
Stratification – 25 Administrative districts were considered as
stratums
Sample size – 450 enumeration areas(25,000 Housing units)
Each enumeration area consisted of 60-80
housing units.
MATCHING OPERATION AND
RECONCILATION
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Matching operation was done by manually under close
supervision
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Field reconciliation visits were done by higher level
officers.
2001 PES QUESTIONS
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Selected HH was enumerated
Reporting on characteristics
•Names of usual HH members
•Relationship to the Head of HH
•Marital status
•Sex
•Age
•Religion
TRAINING OF PES
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Two day training programme was conducted for both
enumerators and supervisors.
Enumerators were mainly statistical officers of the
department
Supervisors were the Statisticians of the department.
PES REPORT WAS PRODUCED TO
INTERNAL USE ONLY
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It was used to understand the accuracy of the result
But not for adjustment of the results
APPLICATION OF THE PES RESULTS TO
IMPROVE THE NEXT PES
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Instruction were improved to get identification of the
correct person
Steps were taken to improve the boundaries of the
maps of enumeration area.
2011 POPULATION CENSUS : PES
PES is planned to be carried out
 PES will be carried out within one month after
the main census.
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2011 PES ACTIVITIES
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Preparation of questionnaire and associated documents
Selection of sample EAs
Pre testing of the questionnaire and pilot PES.
Training of enumerators Supervisors and Field officers
Finalization of documents & procedures.
Field work
Matching of Census data
Reconciliation of main census data and PES
Processing and analysis of PES data
Report writing on PES
Adjustment of the result if necessary
Publication of Report
2011 PES METHODOLOGY
Same as 2001 with some adjustments
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A sample of enumeration areas will be selected
country wide.
Sample size : ( 300-350) EAs ( About 25000
housing units)
Survey instruments ( Questionnaire, manuals,
etc.- Those are being prepared)
INDICATORS TO BE CALCULATED
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Coverage rate
Omission rate
Erroneous inclusion rate
Indices for inconsistency for sex and age for all
domains