摘要
为了客观反映学生对不同难度知识的掌握情况,试卷命题时通常需要按正态分布确定各难度的试题数量.由于数学意义上的正态分布函数是建立在连续空间上的,不能直接适用于试题难度分配算法,因此设计离散数域内正态分布函数值算法就显得更有意义.本文对连续的正态分布函数计算方法进行了改进,解决了试题难度的离散化和试题数量为整型值造成的试题难度正态分分配困难问题.
In order to objectively retlect the grasp of students for knowledge of different difficulty, normal distribution of question numbers of different difficulty is required. From a mathematical view, the normal distribution function is built on a continuous space ; it can not be directly applied to allocation algorithm of test questions. Therefore, the numerical algorithm of normal distribution function in continuous space is improved, so that the difficulty of the discretization of question difficulty and the difficulty of normal distribution of question difficulty caused by the integer value of question number can be solved.
出处
《哈尔滨理工大学学报》
CAS
北大核心
2009年第3期13-15,共3页
Journal of Harbin University of Science and Technology
关键词
正态分布
难度分配
算法
normal
difficult and distribution
the algorithm
