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How do I measure Happiness indirectly and reliably, using a survey?
Answer 1:

You can take a look at the Oxford Happiness survey
Oxford survey

Psychologists Willis and Argyle wrote a nice paper describing the statistics associated with it. It has high reliability, as measured by something called Cronbach's alpha. That value was 0.92, which means that when the survey was re-administered under similar conditions but at varying times, it produced similar results.



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