Estimates of Sampling Error
Sampling errors are presented in Tables B.02 - B.16 of the report RHS 2008, for variables considered to be of major interest. Results are presented for the whole country, for urban and rural areas separately, for each of four education groups, for each of five regions, and for each of three age groups. For each variable, the type of statistic (percentage, mean or rate) and the base population are given in Table B.01. For each variable, Tables B.02 - B.16 present the value of the statistic (R), its standard error (SE), the number of cases (N) where relevant, the design effect (DEFT) where applicable, the relative standard error (SE/R), and the 95 percent confidence limits (R-2SE, R+2SE).
The confidence limits have the following interpretation. For the percentage of currently married women using the contraceptive intrauterine device (IUD), the overall value for the full sample is 22.3%, and its standard error is 0.6%. Therefore, to obtain the 95 percent confidence limits, one adds and subtracts twice the standard error to the sample estimate, which means that there is a high probability (95 percent) the true percentage currently using the IUD is between 21.1% and 23.5%.
The relative standard errors for most estimates for the country as a whole are small, except for estimates of very small percentages. The magnitude of the error increases as estimates for sub-populations such as geographical areas are considered. For the variable IUD, for instance, the relative standard error (as a percentage of the estimated parameter) for the whole country and for urban and rural areas is 2.7 percent, 4.1 percent, and 4.0 percent, respectively. For the five regions, the relative standard error of the variable IUD varies between 5.4 percent and 10.8 percent.
Special mention should be made of the sampling errors for rates. The denominators are exposure-years, and the numerators are either births or deaths in the population under consideration during the indicated period of time.
It should be noted that the survey indicates, with a 95 percent level of confidence, that the TFR for the 3-year period prior to the survey lay between 3.046 and 3.31 children per woman, and that the infant mortality rate for the 3-year period prior to the survey lay between 15.7 and 28.3 per thousand births. The differences between the survey results and registration statistics are not due to sampling variability.
Table B.01 List of Selected Variables for Sampling Error, Mongolia, 2008
Table B.02 Sampling Error - National Sample, Mongolia, 2008
Table B.03 Sampling Error - Urban Areas, Mongolia, 2008
Table B.04 Sampling Error - Rural Areas, Mongolia, 2008
Table B.05 Sampling Error - Primary or Less, Mongolia, 2008
Table B.06 Sampling Error - Incomplete Secondary, Mongolia, 2008
Table B.07 Sampling Error - Complete Secondary, Mongolia, 2008
Table B.08 Sampling Error - More than Secondary, Mongolia, 2008
Table B.09 Sampling Error - Central Region, Mongolia, 2008
Table B.10 Sampling Error - East Region, Mongolia, 2008
Table B.11 Sampling Error - West Region, Mongolia, 2008
Table B.12 Sampling Error - South Region, Mongolia, 2008
Table B.13 Sampling Error - Ulaanbaatar, Mongolia, 2008
Table B.14 Sampling Error - Age 15-24, Mongolia, 2008
Table B.15 Sampling Error - Age 25-34, Mongolia, 2008
Table B.16 Sampling Error - Age 35-49, Mongolia, 2008
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