Backward stepwise selection using the AIC in Cox proportional hazards regression modeling identified 6 variables that were the most associated with survival: age, tumor size, multiple lesions, nodal status, vas
convert_as_factor(), set_ref_level(), reorder_levels(): Provides pipe-friendly functions to convert simultaneously multiple variables into a factor variable. make_clean_names(): Pipe-friendly function to make syntactically valid column names (for input data frame) or names (for input vector)....
The previous output of the RStudio console shows the structure of our example data: It contains two numeric variables x and y.Example: Applying optim Function in RIn this Example, I’ll explain how to use the optim function to minimize the residual sum of squares in the R programming ...
Function 的一个基本格式就是: functionname(arg1, arg2, ...) Arguments 就是你填在function那个括号中间的元素。 比如mean(c(2,5)): mean()就是对括号里的值取平均值的function,c(2,5)就是arguments 查看一个function的代码: 就只需要输入functionname,回车就可以看到了,如下图 设置默认值: 在写function...
Warning message: ‘newdata’ had X rows but variables found have Y rows Warning message: In cor(X) : the standard deviation is zero Warning message: In is.na(data) : is.na() applied to non-(list or vector) of type ‘closure’ Warning message: In mean.default(X) : argument is not...
4.变量重编码 Recoding Variables 重编码是指根据已有变量创建新变量的过程。 比如:将一个连续型变量变为一组类别值、将误编码的值替换为正确值、基于一组分数创建一个表示及格/不及格的变量 要重编码。可以使用R中的逻辑运算符,返回值为布尔类型 5.例子: ...
Control Flow Statements in R – Decision Making and Loops Data Visualization in R Basics of Data Structures with R Cheat Sheet Data Structures in R Programming Data Manipulation in R with Dplyr Package How to import data in R Programming? Variables and Data Types in R Programming Online R Comp...
(df)##'data.frame':36obs.of11variables:## $ 年:num19911991199119911991...## $ 月:num12345678910...## $ 门诊人次:num4.343.454.384.184.324.134.574.314.064.43...## $ 出院人数:num389271385377378349361209425458...## $ 病床利用率:num99.188.310499.5102...## $ 病床周转次数:num1.230.851.211....
Variables in R Programming Basic Vectors in R Programming: Definition & Purpose 5:11 Built-In Functions in R Programming Next Lesson Using the Built-In Help Function in R Programming Practical Application for Programming in R: Using Built-In Functions in R Ch 3. Structures & Operations...
##'data.frame':228obs.of10variables:## $ inst:num333511271117...## $ time:num3064551010210883...## $ status:num2212212222...## $ age:num74685657607468715361...## $ sex:num1111112211...## $ ph.ecog:num1001012212...## $ ph.karno:num909090901005070607070...## $ pat.karno:num100909060...