{'fraction_non_alphanumeric': 0.019285714285714285, 'fraction_numerical': 0.004285714285714286, 'mean_word_length': 5.171806167400881, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
A Research on Vocabulary Size Test for Chinese Second Language E-learning Platform Based on Word Co-occurrence Network

The vocabulary size is one of the important factors that affect the learning effect of Chinese Second Language learners (L2 Chinese learners). As far as L2 Chinese E-learning platform is concerned, many adaptive functions are dependent on L2 Chinese learners’ vocabulary levels. Based on existing related researches, this paper proposes a method for measuring L2 Chinese learners’ vocabulary levels for use on the Chinese E-learning platform: by using a Chinese textbook corpus to build a Chinese word co-occurrence knowledge, vocabulary test is regarded as a test of actual collocation knowledge before and after the target word, thus the required word collocation knowledge can be extracted from the word co-occurrence network. By recruiting L2 Chinese learners to take part in the Chinese vocabulary test, and through a statistical analysis of the test data, it is verified that the test has achieved its expected reliability and validity. This vocabulary size test method for L2 Chinese E-learning platform based on the word co-occurrence network proposed in this research plays a vital role in improving the functions of the E-learning platform because it can generate questions automatically, offer personalized and adaptive tests for the learners, and get accurate results.