## t = -3.7671, df = 18.332, p-value = 0.001374 ## alternative hypothesis: true difference in means between group 0 and group 1 is not equal to 0 ## 95 percent confidence interval: ## -11.280194 -3.209684 ## sample estimates: ## mean in group 0 mean in group 1 ## 17.14737 24.39...
[1] "C:/Users/17822/Documents" (2) 在D盘新建一个文件夹,命名为“statistics”,将此文件夹设置为当前的工作目录。 法1:点击“文件”菜单下的“改变当前目录”,在窗口输入所需的工作目录,或单击“浏览”,选择所需要的工作目录。 法2:在命令行输入setwd("d:\statistics"),注意是双反斜线。 运行结果: > ...
Inferential statistics has two parts: estimation of population parameter and testing of hypothesis. According to the type of medical research, any one of them can be adopted. The estimation method is used in prevalence/descriptive studies and the testing of hypothesis is used for cohort/case contro...
More than 50 years ago, John Tukey called for a reformation of academic statistics. In ‘The Future of Data Analysis’, he pointed to the existence of an as-yet unrecognized science, whose subject of interest was learning from data, or ‘data analysis’. Ten to twenty years ago, John Cha...
Inferential statistics has two parts: estimation of population parameter and testing of hypothesis. According to the type of medical research, any one of them can be adopted. The estimation method is used in prevalence/descriptive studies and the testing of hypothesis is used for cohort/case contro...
聚类分析有两种主要计算方法,分别是凝聚层次聚类(Agglomerative hierarchical method)和K均值聚类(K-Means)。 一、层次聚类 层次聚类又称为系统聚类,首先要定义样本之间的距离关系,距离较近的归为一类,较远的则属于不同的类。可用于定义“距离”的统计量包括了欧氏距离(euclidean)、马氏距离(manhattan)、 两项距离(bin...
# step 0: set up summary statisticsm1=138.9;s1=10.1;n1=200m2=113.4;s2=8.2;n2=225# ...
聚类分析有两种主要计算方法,分别是凝聚层次聚类(Agglomerative hierarchical method)和K均值聚类(K-Means)。 一、层次聚类 层次聚类又称为系统聚类,首先要定义样本之间的距离关系,距离较近的归为一类,较远的则属于不同的类。可用于定义“距离”的统计量包括了欧氏距离(euclidean)、马氏距离(manhattan)、 两项距离(bin...
running direction ind running end running good running in the rain running means running number running or consecutiv running sandal running swimming running to the house running water level running water product runonceexe causes a p runstitching runtime runtucks rununtrue runway condition repo runwa...
由bigmemory包可产生大规模矩阵,一些包可以提供分析这些大规模矩阵的函数。bigannalytics包提供了k-means聚类、行统计量(column statistics)和一个对biglm()的封装。bigtabulate包提供了table()、split()和tapply()的功能,bigalgebra包提供了高等线性代数的函数。