From 29th October to 30th November, 2012, the Afrobarometer surveyed a nationally representative, random, stratified probability sample of 2,400 adult Nigerians. Face-to-face interviews were conducted in the language of the respondent’s choice by the Afrobarometer team based at the Practical Sampling International (PSI). Local language translations were done in four (4) languages: Yoruba, Hausa, Igbo and Pidgin English. CDD-Ghana provided technical backstopping for the survey. Previous Afrobarometer surveys were conducted in Nigeria in 2000, 2003, 2005, 2008, and 2012.
The sample was drawn by taking the smallest geographic units, Census Enumeration Areas (EAs), and stratifying all EAs across the country into separate lists according to states and geographical area (urban/rural). 300 EAs were then randomly selected from these lists with the probability proportionate to its size in the overall population as represented in 2012 population projections based on the 2006 Population and Housing Census provided by the National Population Commission. This ensured 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.