They use factors ranging from job satisfaction to economic progress, health, wealth and education standards, along with weather, war and political stability to judge nations.
Scandinavians do well as their health is good, they are educated to a high standard and they earn more. But warm weather countries can do well too.
Some wealthy Western countries fare less well because there are big divides between rich and poor or they have high unemployment rates or less job satisfaction for instance.
But according to Professor Oswald, many of these may still be miserable even if they are earning a fortune, basking in sunshine and living to 100.
His findings from 131 countries for the ESRC Festival of Social Sciences, found genetics to be the most important factor but not the only one.
Those who are either young or old tend to be happiest rather than those who are middle aged.
Those who are slim are happiest, with obesity levels in some developed countries making them less happy as nations.
And being married, in a job and well educated can also be a contributory factor.
Professor Oswald, said: 'Intriguingly, among the nations we studied, Denmark and the Netherlands appeared to have the lowest percentage of people with the short version of the serotonin gene.'
He added that many individual Americans were happy but they tended to be descended from immigrants who came from countries like Denmark in the first place.
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