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八、比例或百分比抽样 从一个简单随机样本中要估计的量除了本文第Ⅰ、Ⅱ两部分所讨论的均值、总值和两个变量的比率外,有时我们还希望估计总体中具有某些特征或属性或属于某一特定类的单位的总数及其在总体中所占的比例或百分比。许多普查或调查的结果都是这种形式,例如,投某人票的人数占全部投票人数的百分比、考上学的学生占全部考生的百分比、眼睛近视的学生占全部学生的百分比等。在这种调查中,总体可以划分为两类(当然也可以划分为若干类),如在上面的三个例子中就可以分别划分为投某人的票与不投某人的票、考上学与未考上学、眼睛近视与不近视。这种分类可以直接列入调查表中,而让被调查者(打勾)回答他是属于哪
VIII. Proportions or Percentage Sampling From a Simple Random Sample In addition to the mean, total, and ratio of the two variables discussed in sections I and II of this paper, sometimes we would like to estimate some of the features in the population as a whole Or attributes or the total number of units belonging to a particular class and their proportion or percentage in the population. The results of many censuses or surveys are of this type. For example, the percentage of votes cast for a single person to the total number of castings, the percentage of students admitted to school for all candidates, the percentage of students with myopic eyes for all students, etc. In this survey, the overall can be divided into two categories (of course, can be divided into several categories), as in the above three examples can be divided into vote for someone and not vote someone vote, admitted to school And not admitted to school, myopia and myopia. This classification can be directly included in the questionnaire, and let the respondent (tick) to answer where he belongs