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Sampling Overview

PMA2020 uses a two-stage cluster design with typically urban-rural and major regions as the strata. A sample of enumeration areas (EAs) are generally drawn from a master sampling frame covered, usually provided by the national statistical agency in each country. Ahead of data collection, households, health service delivery points (SDPs), and key landmarks in each EA are listed and mapped by resident data collectors. For each EA, a nationally representative sample of households and SDPs are systemically selected. The survey aims to include a sample size that would allow analysts to obtain a national estimate for all indicators, including calculating the modern contraceptive prevalence rate (mCPR) with a margin of error of ±3 percentage points. The target sample considers an expected number of eligible women per household and non-response rates. All resident eligible females are contacted and consented for interviews. Up to three SDPs within the EA are also selected for interviews, along with the public health posts, district hospitals and private health facilities serving the EA.

Data collection is conducted bi-annually in the first two years in each country and annually thereafter.

SURVEY PROTOCOL DOCUMENTS

PMA2020 General Sampling Strategy Memo >> A summary of PMA2020's general survey sampling strategy including survey sampling assumptions and selection. Available in English and French

PMA2020 Service Delivery Point Sampling Memo >> A summary of PMA2020's general survey sampling strategy including survey sampling assumptions and selection. Available in English and French

PMA2020/Nigeria Sampling Memo >> Summarizes the overall survey design and sample size calculation method of last section provides methods regarding post-stratification weights to calculate national-level estimates, unique for Nigeria PMA2020. Available in English

PMA2020 Segmentation and Supplementation Memo >> General guidelines on when segmentation and supplementation should be used. Available in English

PMA2020 Weights Memo >> A summary of the creation of PMA2020 household and female weights. Available in English