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sample是样本 样品的意思 random是随意的随机的的意思 一个是名字一个是形容词

前三个是随机抽样,最后一个是非随机抽样。 当总体数目相对孝个体差异小的时候采用简单随机抽样。随机抽样优点:最符合随机原则,分析抽样误差比较简明。缺点:总体很大时,操作困难。忽略总体已有的信息,降低样本代表性。 当总体数目庞大的时...

A Select a random unit, then count and select every nth unit from there on

因为他抽取的是前1400个,而不是随机从总体逐个抽取的,不属于随机样本

语言代码: library(randomForest)/安装随机森林程序包/ library(foreign) training

Python标准库random模块 (生成随机数模块) random.random() random.random()用于生成一个0到1的随机符点数: 0 b,则生成的随机数n: b

A random sample is one chosen by a method involving an unpredictable component. Random sampling can also refer to taking a number of independent observations from the same probability distribution, without involving any real po...

random cluster sample 随机整群抽样 例句 1.Methods A cluster random sample of 1150 4~6 grades was drawn, whose dietary data were collected and analyzed. 方法随机整群抽取锦州市两所小学4~6年级1150名小学生进行饮食行为的调查。 2.Met...

import randomfor i in range(4): print random.sample([1, 2, 3, 4, 5, 6, 7, 8], 8)for i in range(4): print random.sample(range(10), ...

def convert(snippet, phrase): #pythonic的写法 class_names = [w.capitalize() for w in random.sample(WORDS, snippet.count("%%%"))] #随机的生成一个...

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