Sampling
Sampling Procedure
The survey was conducted using a two-stage sampling method, which gives an equal probability of selection of households. This means that the data are fully comparable with the RHS 1998. The sample frame comprised the listings of households prepared annually in bags and khoroo across the country. Activities designed for improving the quality of data of the sample frame were conducted in the fourth quarter of 2002 and the first quarter of 2003. The actual sampling was based on the 2003 first half-year data.
Distribution of the RHS Household Sampling by Aimag,
Mongolia 2003
Aimag Clusters Number of Households
1 Arhangai 1-13 390
2 Bayan-Olgii 14-23 300
3 Bayanhongor 24-34 330
4 Bulgan 35-42 240
5 Gobi-Altai 43-50 240
6 Dornogobi 51-56 180
7 Dornod 57-64 240
8 Dundgobi 65-70 180
9 Zavhan 71-80 300
10 Ovorhangai 81-94 420
11 Omnogobi 95-100 180
12 Suhbaatar 101-107 210
13 Selenge 108-118 330
14 Tov 119-129 330
15 Uvs 130-139 300
16 Hovd 140-149 300
17 Hovsgol 150-164 450
18 Hentii 165-173 270
19 Darhan-Uul 174-182 270
20 Ulaanbaatar 183-269 2610
21 Orhon 270-279 300
22 Gobisumber 280 30
Total 8400
It was determined from the experience of RHS 1998, and of other countries which have conducted similar surveys, that 25-30 households per cluster would provide an optimum representation. Therefore, this time 30 households were selected for a cluster (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 8,400 households, which is a 1.47 percent sample of all households in the country. This implied the selection of 280 clusters of households. Baghs and horoos were the primary sampling units (PSUs). All 1,674 PSUs were stratified implicitly by aimag and soum, and the selection of the 280 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. 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. Three husbands out of five married women interviewed in each PSU were interviewed using the husband's interview schedule.
Response Rate
Results of the Household and Individual Interviews (Women and Husbands),Mongolia 2003
Residence
Urban Rural Total
Number of Dwellings Sampled 4350 4050 8400
Number of Households Interviewed 4349 4050 8399
Household Response Rate 100.0 100.0 100.0
Number of Eligible Women 5005 4377 9382
Number of Eligible Women Interviewed 4972 4342 9314
Eligible Women Response Rate 99.3 99.2 99.3
Number of Husbands Selected 2134 2095 4229
Number of Husbands Interviewed 2121 2091 4212
Husbands Response Rate 99.4 99.8 99.6
Weighting
Sampling metod RHS2003 is a nation wide.
