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, 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 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 (sq. km.) Population (2008) (million)  Male9.98 (million)  Female (million) Average Population Density322 per sq km Natural Rates of Population Increase 1.1% Life expectancy at Birth (2001)  Male 72 (Years)  Female 76 (Years) Infant Mortality Rate (IMR) (2001))11 (per thousand live births) Literacy Rate 91.1 %  Male 92.6 %  Female 89.7 %

HISTORY OF POPULATION CENSUS IN SRI LANKA Sri Lanka has a long history of Census taking. The first census was conducted in 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 13 th 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 3 rd 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 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 Comparison of Census statistical information with figures from other sources. Post Enumeration Survey (PES) Internal consistency checks.

COMMON SOURCE OF ERRORS Coverage - Omissions - Duplications Content - Non- responses - Influence responses Interview effect Respondent effect

INDEPENDANCY OF PES 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 Measure both coverage and content errors in the results of census. Provides estimates to adjust census results, if necessary. Evaluate the completeness of Births and Deaths registration.

2001 PES METHODOLOGY Coverage : 450 randomly selected EA’s No. of EA’s in the PES sample Colombo metropolitan 150 Urban100 Rural100 Estate100 Total Sri Lanka 450

SAMPLE DESIGN OF PES 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 housing units.

MATCHING OPERATION AND RECONCILATION Matching operation was done by manually under close supervision Field reconciliation visits were done by higher level officers.

2001 PES QUESTIONS 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 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 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 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.

2011 PES ACTIVITIES 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 A sample of enumeration areas will be selected country wide. Sample size : ( ) EAs ( About housing units) Survey instruments ( Questionnaire, manuals, etc.- Those are being prepared)

INDICATORS TO BE CALCULATED Coverage rate Omission rate Erroneous inclusion rate Indices for inconsistency for sex and age for all domains