I think that's probably about it. Maybe rate it on a scale of 1 to 10 or something. Happiness is so subjective that I don't think you CAN rate it on anything but how happy a person says they are.
Even if you were going around asking people if they are happy, how many could you ask? Everyone? What if everyone they asked in Russia was having a crappy day?
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I guess it'd probably just have to be polling, right?