Survey ID Number
MNG_1998_RHS_v01_M
Title
Reproductive and Health Survey 1998
Sampling Procedure
The survey was conducted using a two-stage sampling method, with equal probability of selection of households. The sample frame comprised the listings of households prepared annually in bags and horoos across the country. It was determined from experience of other countries that 25 households per cluster would provide an optimum representation in a country where no such survey has ever before been conducted. (The best cluster "take" depends upon the intra-cluster versus inter-cluster heterogeneity of the principal variables being measured; this can only be determined after carrying out a survey.) For the survey it was planned to select 6000 households, which is a 1,13 percent sample of all households in the country. This implied the selection of 240 clusters of households. Bags and horoos were the primary sampling units (PSUs). All 1684 PSUs were stratified implicitly by aimag and soum, and the selection of the 240 sample PSUs (or clusters) was done systematically with a random start, with probability proportional to the number of registered households. Households were then selected systematically with a random start within each PSU, using an interval directly proportional to the number of households in the PSU. Each registered household in Mongolia had an equal and known probability of being selected in the RHS sample. The selected households were interviewed using the household schedule. All women between the ages of 15 and 49, inclusive, who slept in the household's dwelling the night prior to interview were eligible to be interviewed using the women's interview schedule. Interviewing teams were also instructed to interview 6 husbands of interviewed women in each PSU.
Distribution of the RHS Household Sampling by Aimag, Mongolia 1998
-- Aimag, Clusters, Number of Households
1) Arhangai, 1-12, 300
2) Bayan-Olgii, 13-20, 200
3) Bayanhongor, 21-30, 250
4) Bulgan, 31-37, 175
5) Gobi-Altai, 38-44, 175
6) Dornogobi, 45-49, 125
7) Dornod, 50-57, 200
8) Dundgobi, 58-63, 150
9) Zavhan, 64-73, 250
10) Selenge, 74-83, 250
11) Suhbaatar, 84-89, 150
12) Uvs, 90-99, 249
13) Tov, 100-110, 275
14) Ovorhangai, 111-124, 350
15) Omnogobi, 125-129, 125
16) Hovd, 130-137, 200
17) Hovsgol, 138-150, 325
18) Hentii, 151-158, 200
19) Darhan-Uul, 159-168, 250
20) Orhon, 169-174,149
21) Gobisumber, 175-176, 50
22) Ulaanbaatar, 177-240, 1607
Total number of households 6005