Skip to main content
. 2016 May 13;11(5):e0155195. doi: 10.1371/journal.pone.0155195

Table 3. Language ability indicators.

Indicator Indication Description
TTR (Type-Token Ratio) Vocabulary Size Number of types / Number of tokens
PVS (Potential Vocabulary Size) Vocabulary Size Estimated vocabulary size
VL (Vocabulary Level) Vocabulary Level Ratio of intermediate-level nouns
DepD (Dependency Distance) Grammatical complexity Average gaps in each dependency arc
Yngve Score Grammatical complexity Number of average cases of a verb