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This study investigated the latent structure of L2 linguistic complexity as a multidimensional construct and analyzed the relationship between the sub-constructs of L2 linguistic complexity by employing exploratory and confirmatory analyses of a set of linguistic complexity measures indexing different sources of L2 linguistic complexity. Based on relevant theories and empirical studies, 11 automated measures indexing distinct sources of syntactic and lexical complexity were selected and used to assess the linguistics complexity of 930 EFL argumentative essays, which were then equally divided into two subsamples. Sample 1 was used for exploratory factor analysis while sample 2 was used for confirmatory factor analysis. The results show that L2 linguistic complexity is a multi-dimensional construct composed of clausal subordination, phrasal elaboration and lexical complexity. Furthermore, regarding the relationships among the three sub-constructs, it was found that lexical complexity and phrasal elaboration are moderately correlated; while clausal subordination employs rather different means of complexification than that employed by phrasal elaboration and lexical complexity. Findings of the study provide empirical evidence for the multidimensionality of L2 linguistic complexity in L2 argumentative writing and lend support to the hypothesis that lexical complexity and grammatical complexity constitute separate, independent dimensions of L2 performance and proficiency, and that there was a certain level of trade-off effect between them.

Exploratory and Confirmatory Factor Analyses of L2 Linguistic Complexity Measures