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2 区分度 试题的区分度,是指某一试题对不同学业水平的考生加以区分的程度或鉴别能力。换言之,就是试题相对于什么标准来说是有效的,程度如何?大多数情况下,试题的区分度是以该考试本身的总分为标准的,是从考试内部来看的,极少数情况下,才以别的考试为标准,即外部标准。无论从哪种角度来看试题的区分度,在计算方法上都是一样的,差别只在于用哪一种考试分数来作标准。 计算区分度的方法按题型的不同,有如下几种: (1)客观性试题区分度计算公式:
2 Differentiating degree The degree of discrimination of a test question refers to the degree or discriminating ability of a test question to different examinees. In other words, the question is valid with respect to what criteria, and how the degree is. In most cases, the degree of differentiation of the questions is based on the total score of the examination itself. It is viewed from the inside of the examination, in rare cases. Only the other exams are the standards, that is, the external standards. Regardless of the perspective of the test, the calculation method is the same. The only difference is which test score to use as a criterion. The method of calculating the degree of discrimination is different depending on the type of question, as follows: (1) Formula for calculating the degree of differentiation of objectivity: