Aim One
Goodness-of-fit metrics suggested that a four-topic model was optimal (see Supplemental Table 1). The most strongly representative words (measured by term score11Because some words are highly probable across all or several topics, word probabilities alone are not always sufficient to interpret a topic. Term scores emphasize words thatuniquely represent each topic by downweighting words that are highly probable across many topics.; Blei & Lafferty, 2009) associated with each topic are shown in Table 1. Face validity of the topics were assessed third and last author. Topic 1 corresponded to discussion of daily difficulties (i.e., tax, staff, homeless); Topic 2 corresponded to discussion regarding family members (i.e., dad, mom, sister); Topic 3 corresponded to the use of adjectives often used as verbal fillers (i.e., like, really, things); and Topic 4 corresponded to discussion of friendships and romantic relationships (i.e., friends, talking, meet, dating).