This tutorial is helpful for those students who are interested in gaining the knowledge of how data analysis projects are implemented. This tutorial covers all the basics of R and how data analysis is done using R. Problems We assure you that you will not find any problem with this R Progra...
更深入的可以读《Lattice:Multivariate Data Visualization with R》。上面这些都是比较普通的。当然,有比较文艺和优雅的——ggplot2系统,看《ggplot2:Elegant Graphics for Data Analysis》。还有数据挖掘方面的书:《Data Mining with Rattle and R》,主要是用Rattle软件,个人比较喜欢Rattle!当然,Rattle不是最好的,Rw...
Sample Size Estimation in Clinical Research: From Randomized Controlled Trials to Observational Studies - PubMed () floppybunny.org/robin/web/virtualclassroom/stats/basics/articles/gpower/Gpower_tutorial_Prajapati_2010-.pdf https://eprints./97113/8/WRRO_97113.pdf https://www./calculators/power-s...
> for(n in 1:500){ + Anew = sample(A, size = 100, replace = T) # 有放回抽样 + Bnew = sample(B, size = 100, replace = T) + Cnew = sample(C, size = 100, replace = T) + dftemp = data.frame(score = c(Anew, Bnew, Cnew), + school = rep(c('A','B','C'),...
Code Schoolhas a free R tutorial athttp://tryr.codeschool.com/. http://www.cookbook-r.com/is a compact book that gives you a quick review of R. Data for an R student: Once you have learned the basics of R, it is time to practice on datasets. Datasets can be downloaded from: ...
Data do not always come so nicely aligned for combing usingcbindand need to be joined together using a common key. This concept should be familiar to SQL users. Joins in R are not as flexible as SQL joins, but are still an essential operation in the data analysis process. ...
1、SAS软件 SAS软件是生物统计领域的老牌软件，其权威性一直很高。SAS 是英文Statistical AnalysisSystem的...
Rather than being a 'finished' document, the tutorial is designed to be continually updated, based on comments from the users. Also, it is possible for anyone with a GitHub account to edit the document directly, by simply hitting the 'Edit' button when looking at the master .Rmd document....
Yingxiang Huang, Wentao Li, Fima Macheret, Rodney A Gabriel, Lucila Ohno-Machado, A tutorial on calibration measurements and calibration models for clinical prediction models, Journal of the American Medical Informatics Association, Volume 27, Issue 4, April 2020, Pages 621–633, https://doi.org...
plyr包的函数较多,不再一一介绍,更多用法请参考它的在线帮助,Hadley 也写了很详细的tutorial:http://plyr.had.co.nz/09-user/ 知识点_2 下面首先来用一个简单的例子说明一下用法。还是用iris数据集,其中包括了一个分类变量和四个数值变量。我们希望数据按不同类别,分别计算数值变量的均值。下面...