[R] to get how many participants in the dataframe and use it

R 复制代码
prop1 <- sum(GE_survey$`Q17_What department are you in` == "HSS") / nrow(GE_survey)
  1. nrow() and ncol() : Suppose you have a dataset my_data that contains information about customers, with each row representing a different customer and each column representing a different attribute (e.g., ID, name, age, etc.). You can use nrow(my_data) to find out how many customers are in the dataset and ncol(my_data) to find out how many attributes each customer record has.

  2. length() : If you have a vector my_vector containing the sales figures for each month of the year, you can use length(my_vector) to find out how many months of sales data you have.

  3. dim() : Suppose you have a matrix my_matrix that represents the results of a survey, with each row representing a different question and each column representing a different respondent. You can use dim(my_matrix) to find out how many questions were asked in the survey and how many respondents answered the survey.

  4. dimnames() : If my_matrix has row and column names indicating the questions and respondent IDs, respectively, you can use dimnames(my_matrix) to access and manipulate these names.

  5. attributes() : If you have a data frame my_df that contains information about products, including their names, prices, and quantities, you can use attributes(my_df) to view or modify the attributes of the data frame, such as its column names or class.

These functions are commonly used in data analysis and manipulation tasks to understand and work with the structure of your data.

相关推荐
weixin_4461224632 分钟前
JAVA内存区域划分
java·开发语言·redis
悦悦子a啊35 分钟前
Python之--基本知识
开发语言·前端·python
QuantumStack1 小时前
【C++ 真题】P1104 生日
开发语言·c++·算法
whoarethenext2 小时前
使用 C++/OpenCV 和 MFCC 构建双重认证智能门禁系统
开发语言·c++·opencv·mfcc
代码的奴隶(艾伦·耶格尔)2 小时前
后端快捷代码
java·开发语言
Jay_5153 小时前
C++多态与虚函数详解:从入门到精通
开发语言·c++
路来了3 小时前
Python小工具之PDF合并
开发语言·windows·python
xiaolang_8616_wjl4 小时前
c++文字游戏_闯关打怪
开发语言·数据结构·c++·算法·c++20
WJ.Polar4 小时前
Python数据容器-list和tuple
开发语言·python
FrostedLotus·霜莲4 小时前
C++主流编辑器特点比较
开发语言·c++·编辑器