Specifically, we can explore "business-as-usual" content using the posterior expected values of the general topicsˇ1; : : : ;ˇK and the entity topics Á 1 ; : : : ; Á A , and we can detect and characterize events using the posterior expected values of the event strengths and the event topics.
to detect events, we define an measure that quantifies the "eventness" of time interval t. we first compute how relevant each message d is to that time interval: m dt D f .t d ; t / EOE dt .