Random route procedures are used to select sampled households.
Where population information is available, sample selection is based on probabilities proportional to population size otherwise, simple random sampling is used. These units are stratified by population size, geography, or both, and clustering is achieved through one or more stages of sampling.
In economies where face-to-face surveys are conducted, the first stage of sampling is the identification of primary sampling units. In most economies the fieldwork is completed in two to four weeks. Interview procedure Surveys are conducted face to face in economies where telephone coverage represents less than 80 percent of the population or where this is the customary methodology. The target population is the entire civilian, noninstitutionalized population age 15 and above. The survey was carried out over the 2017 calendar year by Gallup, Inc., as part of its Gallup World Poll, which since 2005 has annually conducted surveys of approximately 1,000 people in each of more than 160 economies and in over 150 languages, using randomly selected, nationally representative samples. The indicators in the 2017 Global Findex database are drawn from survey data covering almost 150,000 people in 144 economies-representing more than 97 percent of the world’s population (see Table A.1 of the Global Findex Database 2017 Report for a list of the economies included).
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