サンプリングテクニック

Nakhon Ratchasima Province
↓ ← Purposively selected
Muang District 25 sub-districts
↓ ← simple random sampling
Sub dist 1 Sub dist 2 Sub dist 3 Sub dist 4 Sub dist 5 Sub dist 6
↓ ↓ ↓ ↓ ↓ ↓ ← Simple random sampling
55 113 122 34 30 48
↓
402 VHVs

↓

Subdistrict Name Random no Number of VHVs Sample no
1 Nongchabog 3 206 55
2 Nongpailom 10 425 113
3 Choho 16 460 122
4 Chaimongtkol 18 127 34
5 Panoa 23 114 30
6 Nongkatum 24 182 48
　 Total 1514 402