Prevalence-Polarity Index (UNGA Global Finance)

The polarity is -1 if the speech contains at least two instances of a term associated with a zero-sum narrative of the global financial system and 1 otherwise. The salience score [0,1] is the year-normalized sum of structural topic model posteriors clustered around the topic pertaining to the Bretton Woods institutions.

A high and positive λ suggests that the document has a high proportion of the economic topic-cluster combined with an overall positive tone, relative to other UNGA speeches in a given year. Conversely, a high and negative prevalence-polarity indicator suggests that a document where the economic topic cluster is prevalent, but with a zero-sum narrative