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Multi-stage stratified cluster sampling method
| Stage 1 | Stage 2 | Stage 3 | Stage 4 | Sample size | |
|---|---|---|---|---|---|
| Urban areas |
Central city zone |
Community units / Township |
Community Residents’ Committee |
Individuals |
|
| ×1 |
×6 |
×6 |
×85 |
3060 |
|
| Rural areas | Counties |
Towns |
Villages |
Individuals |
|
| ×3 | ×4 | ×3 | ×85 | 3060 |
