random sample发音 意思翻译 [数]随机样本;随意抽取调查;[天]随机样品 n.随机抽样调查 相似词语短语 random samples───[数]随机样本;随意抽取调查;[天]随机样品 random sampling───[数]随机抽样;随意采样 random samplings───[数]随机抽样;随意采样 ...
Sampling Bucketed Table 优势:fast and random Sample codes: SELECT * FROM table_sample TABLESAMPLE (BUCKET 1 OUT OF 10 ON rand()) 注:利用分桶表,随机分到多个桶里,然后抽取指定的一个桶。举例:随机分到10个桶,抽取第一个桶 Random Sampling 1 优势:此时,可以提供真正的随机抽样 缺点:需要在单个 red...
R语言使用sample函数采样dataframe数据行(sampling)、设置抽样个数、没有放回抽样模式 # take a random sample of size 50 from a dataset mydata # sample without replacement mysample <- long[sample(1:nrow(long), 5, replace=FALSE),] mysample 安利一个R语言的优秀博主及其CSDN专栏: 博主博...
1)random sample随机抽取 英文短句/例句 1.500 freshmen were collected by random sampling.整群随机抽取500名入学新生,采用症状自评量表(scl-90)进行研究。 2.Methods 108 senior high school students at Dingzhou of Hebei were taken out randomly and investigated with anxious interview.方法随机抽取河北省定州中...
复数:samples现在分词:sampling过去式:sampled 搭配 同义词 v.+n. use sample,send sample,take sample,provide sample,give sample adj.+n. small sample,large sample,free sample,representative sample,random sample 权威英汉双解 英汉 英英 网络释义
random.sample(population, k) Return a k length list of unique elements chosen from the population sequence. Used for random sampling without replacement. 上面的document并不完整,不过也可以看出,是从序列(sequence)中随机选择k个元素,返回的是一个新的list,原来的序列不受影响。
sample distribution,sampling,sample- items selected at random from a population and used to test hypotheses about the population 2.random sample- a sample grabbed at random sample- a small part of something intended as representative of the whole ...
Hajek J. Limiting distribution in sample random sampling from finite populations. Publications of the Mathematics Institute of the Hungarian Aca- demy of Science 1960; 5:361-74.Hajek J. (1960), Lim iting distribution in sample random sam pling from a finite populations, Publications o f the M...
Simple random sampling of a sample “n” of 3 from a population “N” of 12. Image: Dan Kernler |Wikimedia Commons Imagine the people illustrated in the image above are game pieces. Place the 12 game pieces in a bowl and (again, without looking) choose 3. This is simple random sampl...
Example:randsample(20,10)returns a vector of10values sampled uniformly at random, without replacement, from the integers1to20. Data Types:single|double replacement—Indicator for sampling with replacement false(default) |true Indicator for sampling with replacement, specified as eitherfalseortrue. ...