测验或考试的命题质量如何,能否对考生的知识程度和能力进行有效的测量,除了上一讲介绍的试题难度和区分度知识外,还需要对试卷做整体分析,试卷整体分析的指标主要是信度和效度。一、信度信度是指测验结果的可靠程度,它是表明测验稳定性、可靠性的重要指标。如果考试的成绩与学生的真实水平完全一致,我们说此考试的信度最大,或者说,这次考试完全可靠。信度可用相关系数来表示,称为信度系数。其数值介于-1与+1之间,在标准化考试中,一般要求信度值达0.9以上。 (一)信度的种类及其计算方法 1.分半信度。此种信度表示法应用广泛。它只需用同一张试卷对同一批学生进行一次测试。具 Test or test the quality of the proposition, whether the candidate’s knowledge level and ability to effectively measure, in addition to the previous talk about the difficulty of the test and the distinction between the knowledge, but also to do a comprehensive analysis of the papers, papers overall analysis of the main indicators Is reliability and validity. First, the reliability and reliability is the reliability of the test results, it is an important indicator of test stability and reliability. If the result of the exam is exactly the same as the actual level of the student, we say that the exam is the most reliable, or that the exam is completely reliable. Reliability can be used to express the correlation coefficient, known as the reliability coefficient. Its value between -1 and +1, in the standardized test, the general requirement reliability value of 0.9 or more. (A) the type of reliability and its calculation method 1. sub-half reliability. This belief representation is widely used. It only needs to test the same batch of students with the same test paper. With