World Values Survey – Vietnam (2001)
- To gather a nationally representative sample using area probability sampling method, 20 provinces were randomly chosen among the 61 provinces of the country. The chosen provinces were distributed across eight census regions.
- Of the 20 provinces, a proportionate sample calculated by the province’s population determined the number of districts to be drawn for each province.
- From each chosen district, two villages or wards were randomly selected.
- For each village or ward, eight households were chosen using a designated-walk procedure.
- A member of the household who is over 18 and has the closest birthday was approached for the interview. No other person may be substituted.
- The desired sample was 1,000. The number of households contacted included an over-sampling of 1,300 for estimated potentially high non-response rates.
- Interviewing was conducted between August 28 and September 30, 2001.
Below is the distribution of provinces across eight regions and the number of districts chosen per province (in parentheses):
- Red River Delta: Ha Noi (8), Hung Yen (3), Ha Nam (2), Thai Binh (6)
- Northeast: Lao Cai (3), Phu Tho (5), Bac Giang (6)
- Northwest: Lai Chau (3)
- North Central: Thanh Hoa (10), Ha Tinh (3)
- Central Coast: Quang Nam (4), Binh Dinh (5)
- Central Highlands: Dac Lac (4)
- Southeast: Ho Chi Minh City (13), Lam Dong (2), Binh Phuoc (2)
- Mekong River Delta: Dong Thap (5), An Giang (6), Ben Tre (4), Can Tho (6)