4. Map­ping America’s emo­tional stateMovie Camera
Psy­chi­a­trists aren’t run­ning machine learning on their patients’ Twitter pro­files – yet. But large vol­umes of tweets can be used to make asser­tions about the hap­pi­ness of large groups of people. A sen­ti­ment analysis run by Alan Mis­love of North­eastern Uni­ver­sity in Boston mea­sured every public tweet posted between Sep­tember 2006 and August 2009, using a psy­cho­log­ical word-​​rating system to iden­tify happy or sad tweets. It turns out that the US west coast is hap­pier than the east. Hap­pi­ness peaks each Sunday morning, then dives to an all-​​week low on Thursday evenings.

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