Final Report (PDF, 2132K) - Measure DHS

APPENDIX ASURVEY DESIGNA.1 Sample Design and ImplementationThe sample specifications for the ODHS called for a self-weighting sample of approximately3,600 women 15-49 representative of the entire state. Considering the cultural homogeneity of OndoState, it was decided that an efficient design would be achieved with 90 primary sampling units (PSUs).Thus, the overall sampling fraction for the ODHS wasF3960(Population of Ondo State) (.22)where 3960 is the target sample size increased by 10 percent for nonresponse, and.22 is an estimate of the proportion of women 15-49 in the population(National Population Bureau, 1984).A two-stage sampling procedure was used. In the first stage, census enumeration areas (EAs),were selected with sampling fraction f(1). In the second stage, households were selected with samplingfraction f(2). Within selected households, eligibility for the woman's questionnaire was on a de factobasis: all women 15-49 who stayed in the household the previous night were eligible respondents.Sampling FrameThe sampling frame for PSU selection consisted of two lists of enumeration areas. One listcovered 13 of the 17 Local Govemment Areas (LGAs) of Ondo State and was created between 1984 and1986 as part of Enumeration Area Demarcation Exercise of the National Population Bureau. The otherlist, covering 4 LGAs, consisted of the enumeration areas created for the 1973 Population Census andupdated for the ODHS. EAs in the sampling frame showed little variation in measure of size, so that itwas unnecessary to consider selection of the first stage with probability proportional to size.First Stage SelectionWithin each Local Government Area, the EAs were listed with urban areas first in order toachieve some implicit stratification. A systematic sample of 90 EAs was then selected using thefollowing procedure. The total of 7,638 EAs was divided by 90 to give 85 (f (1) = .0118); a randomnumber was selected between 1 and 85; then EAs were selected from the list at the fixed interval of 85,starting with the random number.Household ListingThe next step was to list households in the selected EAs. During the listing operation, the numberof persons residing in each household was recorded. At this stage, it was observed that the EA77