From their link at Facebook:
The graph contains several metrics. The first, GNH represents our measure of Gross National Happiness. The other two, Positivity and Negativity, represent the two components of GNH: The extent to which words used on that day were positive and negative. Gross National Happiness is the difference between the positivity and negativity scores, though they are interesting to view on their own.
From NYTimes article:The idea, one that is generally accepted in social psychology, is that word choice can reveal a person’s mood.
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