Sampling Frames and Sample Design Pres 5 United

Sample Frames & Sample Design Frames: Material from which a sample is drawn o.

Characteristics of Good Area PSUs q Boundaries well delineated with clear physical boundaries q

Sample Size Sample size depends on estimate requirements q Geographic level (national, province, urban/rural)

Importance of Stratification q Population subdivided into heterogeneous groups that are internally homogenous q

Sampling Strategies q Probability household surveys q It is usual to make inferences in

Why Multi-stage Cluster Sampling? q Reduces travel and other costs related to data collection

Thank You! United Nations Regional Workshop on the 2010 World Programme on Population and

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Sampling Frames and Sample Design Pres. 5 United Nations Regional Workshop on the 2010 World Programme on Population and Housing Censuses: Census Evaluation and Post Enumeration Surveys, Asunción, Paraguay, 3 -7 August 2009

Sample Frames & Sample Design Frames: Material from which a sample is drawn o. Each unit to be included in the universe o. There should be no duplicates o. Each unit should be well defined and distinguishable from other units (it should be unique) o. Should be updated o. For PES first stage units PSUs, in many countries area clusters United Nations Regional Workshop on the 2010 World Programme on Population and Housing Censuses: Census Evaluation and Post Enumeration Surveys, Asunción, Paraguay, 3 -7 August 2009

Characteristics of Good Area PSUs q Boundaries well delineated with clear physical boundaries q They should be mapped q Must cover the whole country q Preferably should have some measures of size (MOS) United Nations Regional Workshop on the 2010 World Programme on Population and Housing Censuses: Census Evaluation and Post Enumeration Surveys, Asunción, Paraguay, 3 -7 August 2009

Sample Size Sample size depends on estimate requirements q Geographic level (national, province, urban/rural) q Demographic (sex, age) q Reliability q Confidence level United Nations Regional Workshop on the 2010 World Programme on Population and Housing Censuses: Census Evaluation and Post Enumeration Surveys, Asunción, Paraguay, 3 -7 August 2009

Importance of Stratification q Population subdivided into heterogeneous groups that are internally homogenous q Stratification based on variables correlated with the extent of coverage-geopolitical subdivisions q Internal homogeneity can be maintained with regard to socio-demographic variables e. g. urban stratum q Common strata may include: rural, urban, provinces etc. United Nations Regional Workshop on the 2010 World Programme on Population and Housing Censuses: Census Evaluation and Post Enumeration Surveys, Asunción, Paraguay, 3 -7 August 2009

Sampling Strategies q Probability household surveys q It is usual to make inferences in a PES for a number of analytical domains q Relatively large samples necessary in each domain for reliable estimates q Stratified cluster sample design-common q First-stage units–area clusters/EAs q PPS systematic sample selection q Second-stage, common to canvass all persons in selected households United Nations Regional Workshop on the 2010 World Programme on Population and Housing Censuses: Census Evaluation and Post Enumeration Surveys, Asunción, Paraguay, 3 -7 August 2009

Why Multi-stage Cluster Sampling? q Reduces travel and other costs related to data collection q Strategy can improve supervision q Construction of frame cascading in stages, therefore, cheaper q Matching operations more efficient United Nations Regional Workshop on the 2010 World Programme on Population and Housing Censuses: Census Evaluation and Post Enumeration Surveys, Asunción, Paraguay, 3 -7 August 2009

Thank You! United Nations Regional Workshop on the 2010 World Programme on Population and Housing Censuses: Census Evaluation and Post Enumeration Surveys, Asunción, Paraguay, 3 -7 August 2009