he primary purpose of this study was to provide validity evidence for the Vocabulary Size Test ,which is designed to measure the vocabulary size of non - English majors in universities. The preliminary test papers were established by integrating principles from literature review. After two experimental tests on students ,the final Vocabulary Size Test Paper containing 104 i- tems was produced based on their item discrimination and difficulty. Results showed: its Cronbach's coefficient was 0 . 918; test - retest reliability was 0 . 644 ,p = 0 . 000 ; discrimination validity was t = 6. 358 ,p = 0 . 000 ; Correlation coefficients between lev- els scores were from 0 . 068 to 0 . 496; Correlation coefficients total score and levels scores were from 0 . 294 to 0 . 812 ,fitting me- trology demand. The conclusion was that the Vocabulary Size Test Paper has sound psychometric properties for Chinese college students 。
XU Liu-Ming, LIU Zhen-Qian.
Developing and Validating a Vocabulary Size Test Instrument[J]. Foreign Language Learning Theory and Practice. 2013, 02(1): 79-85