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The CAF World Giving Index report, 2017 is primarily based upon data from Gallup’s World View World Poll, which is an ongoing research project carried out in 139 countries in 2016 that together represent around 95% of the world’s population (around 5.2 billion people). The survey asks questions on many different aspects of life today including giving behaviour. The countries surveyed and questions asked in each region varies from year to year and is determined by Gallup. In most countries surveyed, 1,000 questionnaires are completed by a representative sample of individuals living across the country. The coverage area is the entire country including rural areas. The sampling frame represents the entire civilian, non-institutionalised, aged 15 and older population of the entire country. In some bigger countries, larger samples are collected (e.g. 4,373 interviews in China; 2,000 in Russia), while in a small number of countries, the poll covers 500 to 1,000 people but still features a representative sample. The survey is not conducted in a limited number of instances including where the safety of interviewing staff is threatened, scarcely populated islands in some countries, and areas that interviewers can reach only by foot, animal or small boat. In all, more than 146,000 people were interviewed by Gallup in 2016 and samples are probability-based. Surveys are carried out by telephone or face-to-face depending on the country’s telephone coverage. There is of course a margin of error (the amount of random sampling error) in the results for each country, which is calculated by Gallup around a proportion at the 95% confidence level (the level of confidence that the results are a true reflection of the whole population). The maximum margin of error is calculated assuming a reported percentage of 50% and takes into account the design effect.
The percentages shown in the Index and within this publication are all rounded to the nearest whole number or to one decimal place. In reality though, for the analysis by CAF, the percentage scores are to two decimal places.