Nigeria Round 3 summary of results

From August 28 to December 31, 2005, the Afrobarometer surveyed a nationally representative random, stratified probability sample of 2363 Nigerians. Face to face interviews were conducted by the Afrobarometer team based at Practical Sampling International (PSI). The sample was drawn by taking the smallest geographic units, census Enumeration Areas (EA’s), and stratifying all EA’s across the country into separate lists according to region, race, and urban/rural status. EA’s were then randomly selected from these lists with the probability proportionate to its size in the overall population as represented in an updated version of the National Integrated Survey of Households (NISH) sample frame provided by the Federal Office of Statistics, which itself was drawn from the 1991 census by the National Population Commission. This ensures that every eligible adult had an equal and known chance of being selected. Eight households were then randomly selected within each EA, and a respondent 18 years of age or older was randomly selected from each household. A gender quota ensured that every other interview must be with a female. A sample of this size is sufficient to yield an overall margin of error of +/- 2 percent at a confidence level of 95 percent.