Happiness research

Some researchers, such as David T. Lykken, have found that about 50% of one’s happiness depends on one’s genes, based on studying identical twins, whose happiness is 50% correlated even when growing up in different houses.1

About 10% to 15% is a result of various measurable life circumstances variables, such as socioeconomic status, marital status, health, income, sex and others.2

The remaining 40% is a combination of unknown factors and the results of actions that individuals deliberately engage in to become happier. These actions may vary between persons.

References
wikipedia

1. Sonja Lyubomirsky, David Schkade and Kennon M. Sheldon, "Pursuing Happiness: The Architecture of Sustainable Change," Review of General Psychology, Vol. 9, No. 2, 111–131, 2005
2. http://www.nber.org/papers/w10499

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