初中词汇理解能力量表的编制

应用项目反应理论为初中各年级编制了词汇理解能力的测验，其中包含了１４３个多项选择的词汇项目，经过反复预测和大规模的正式测试，证关了这三个测验的量表拟全于２ＰＬ模型，项目特征曲线拟合度良好的项目占全体项目数９０％以上，能力的一维性也得以确认，经等值化后，各年级的区分度均值分别为０．６１（初一），０．５９（初二），０．５５（初三）难度均值分别为－１．６１，－１．３０，－０．５６。

CONSTRUCTION OF VOCABULARY TESTS FOR JUNIOR SCHOOL LEVEL

The present study was to construct three vocabulary tests at junior school level that could be used for measuring the student's lability of word omeaning comprehension.The three tests were constructed of 143 words multiple-choice items and administered to about 3000 students. The statistical item analysis and the test of goodness-of-fit of the 2PL model showed 90% vocabulary items could be used for IRT analysis. IRT analysis of the item responses was carried out separately for each test and estimated item parameters were equated utilizing the anchor items included in all the tests, the mean discrimination parameter of each grade was 0.61(grade7), 0.59(grade8),0.55(grade9); the mean difficulty parameter was - 1.61, - 1.30, - 0.56 respectively.