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"Where does this data come from?

Source: The World Happiness Report which leverages data from the Gallup World Poll.

Methodology: A nationally representative group of approximately 1,000 people is asked a series of questions relating to their life satisfaction, as well as positive and negative emotions they are experiencing. The life evaluation question is based on the Cantril ladder, wherein the top of the ladder represents the best possible life for a person (a score of 10/10) and on the flipside, the worst possible life (scored as 0/10). The main takeaway is that the scores result from self-reported answers by citizens of each of these countries. The results received a confidence interval of 95%, meaning that there is a 95% chance that the answers and population surveyed represent the average. As well, scores are averaged over the past three years in order to increase the sample size of respondents in each country.

Criticisms: Critics of the World Happiness Report point out that survey questions measure satisfaction with socioeconomic conditions as opposed to individual emotional happiness. As well, there are myriad cultural differences around the world that influence how people think about happiness and life satisfaction. Finally, there can be big differences in life satisfaction between groups within a country, which are averaged out even in a nationally representative group. The report does acknowledge inequality as a factor by measuring the “gap” between the most and least happy halves of each country."