Table 1.
Latent factor structure, connected language measures and definitions.
| Factor name | Connected language measure | Definition |
|---|---|---|
| Semantic | Percent nouns | |
| Percent verbs | ||
| Pronoun index | Number of pronouns/nouns + pronouns | |
| Syntax | Verb index | Number of verbs/number of utterances |
| Proposition density | Ratio of propositions (verbs, adjectives, adverbs, prepositions and conjunctions) to total number of words, based on Computerized Propositional Idea Density Rater (CPIDER3) (Brown et al., 2008; Covington and McFall, 2010; Macwhinney et al., 2011) | |
| Grammatical complexity | Number of grammatical relations that mark syntactic embeddings/total number of grammatical relations (Macwhinney et al., 2011) | |
| Lexical | Type-token ratio | Number of unique words/number of words |
| Number of unique words | ||
| Semantic unit idea density (SUID) | Number of semantic units [as defined by Croisile et al. (1996) and Ahmed et al. (2012)] | |
| Fluency | Maze index | Number of filled pauses, false starts, revisions, +repetitions/total number of utterances |