Sampling Procedure
For this study, a national sample of the African South African population 18 years or older was drawn. South Africa was stratified into three primary strata: (a) metropolitan areas, (b) other urban areas and (c) rural areas. Samples were then drawn independently from each of the three types of localities. Initially, in each of the three locality types, 800 respondents were to be drawn, resulting in a total sample size of 2,400. The 800 respondents in each stratum were to be drawn from 20 randomly selected Primary Sampling Units (PSUs), either a "transitional local council" (TLC) or a "transitional rural council" (TRC) in the following way: Four Enumerator Areas (EAs) would be randomly selected in each PSU. From each selected EA 10 households would be randomly selected, and finally, one adult respondent would be selected randomly in each household. It was later decided to draw 11 households in each EA, instead of 10, to ensure that there would be sufficient room to deal with refusals and non-responses.
Weighting
Since the allocation of sample elements was not done proportionally, it was necessary to introduce unequal weights to the sample elements in order for the sample to be a true representation of the population.