其使用了R的三大法宝:逻辑测试,取子集和元素方式执行 先来看一个例子,state.division这个数据集(来源于R中自带的datasets包)记载的是美国各州所在的地区,分别为New England, Middle Atlantic, South Atlantic, East South Central, West South Central, East North Central, West North Central, Mountain, and Pacifi...
mean(iris[iris$Species=="virginica",2])##the above is error,not correct##tapply(test$Sepal.Length,test$Species,mean)#用species.mean对向量进行分组,此法可行,但上述方法为何错误需要再看 library(datasets) data(mtcars) #以下为做某个题时的若干测试。以及试错环节。lapply, tapply,split的用途,以及[[...
## Reading in Larger Datasets with read.table # With much larger datasets, doing the following things will make your file # easier and will prevent R from choking. # Read the help page for read.table, which contains many hints. ?read.table # 当读取大的数据库时,会占用非常的内存。 # 节...
This book is about the fundamentals of R programming. You will get started with the basics of the language, learn how to manipulate datasets, how to write functions, and how to debug and optimize code. With the fundamentals provided in this book, you will have a solid foundation on which ...
The course assumes some programming experience (in any language) and working knowledge of mathematics up to algebra. Key Highlights Gain fluency at the R console Be able to create tidy datasets from a wide range of possible data sources
Bootstrapping is a technique used in inferential statistics that work on building random samples of single datasets again and again. Bootstrapping allows calculating measures such as mean, median, mode, confidence intervals, etc. of the sampling.bootstrap基本思路是对原来的分析数据进行有放回的随机...
Submitting Author: Name (@vnmabus) All current maintainers: (@vnmabus) Package Name: rdata One-Line Description of Package: Read R datasets from Python. Repository Link: https://github.com/vnmabus/rdata Version submitted: 0.9.2.dev1 Edit...
Reading in Larger Datasets with read.table With much larger datasets, doing the following things will make your life easier and will prevent R from choking. Read the help page for read.table, which contains many hints Make a rough calculation of the memory required to store your dataset. If...
Over 430 pages you’ll get a brilliant selection of theory and practice for statistical learning in R. This book may feel like a college textbook yet it reads like a relaxed programming book. An Introduction to Statistical Learningfocuses on R using examples of statistics and big datasets. This...
Projects allow you to apply your knowledge to a wide range of datasetsto solve real-world problems in your browser project NYC Airbnb Data Analysis 0.75 hours 5.4KApply data importing and cleaning skills to extract insights about the New York City Airbnb market. project Dr. Semmelweis and th...