| Box 1. Nigeria NDHS 3-Stage Cluster Sampling | ||
| Stage |
Approach |
Outcome |
| 1st Stage Selection of localities | • Sampling frame:2006 National census Enumeration Areas (EA) • Stratification of states into urban /rural • Independent selection in each stratum with probability of selection proportional to size. | 893 localities nationally |
| 2nd Stage Selection of EAs/clusters | • Random selection of EAs (equal probability selection). • Mapping and household listing of selected clusters. • Household lists as Secondary sampling units (SSU). | 904 clusters based on EAs 372 (urban) and 532 (rural) |
| 3rd Stage Selection of households | 45 Households selected in each rural /urban cluster | 40,680 Households (Urban 16,740, Rural 23,940) |
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.