如何更改R中箱线图的顺序？

Question

我需要帮助，我在R中建立了箱形图，但它没有我需要的顺序。我需要命令升序。为Hekp我致敬]

我以另一种方式做到了：

value <- c( sample(2:5, 20 , replace=T) , sample(6:10, 20 , replace=T), 
            sample(1:7, 20 , replace=T), sample(3:10, 20 , replace=T) )
data <- data.frame(days,value)
boxplot(data$value ~ data$days)```

Answer 1

您可以在factor（）函数中使用'levels'参数指定因子的顺序。

#days column is by default ordered alpabetically
data <- data.frame(days = c(rep("Monday", 20),
                            rep("Tuesday", 20),
                            rep("Wednesday", 20),
                            rep("Thursday", 20)), 
                   value = c( sample(2:5, 20 , replace=T) , sample(6:10, 20 , replace=T), 
                              sample(1:7, 20 , replace=T), sample(3:10, 20 , replace=T) ))

boxplot(data$value ~ data$days)

#change order with 'factor()' and specify order with 'levels' argument
data$days <- factor(data$days, levels = c("Monday", "Tuesday", "Wednesday", "Thursday"))
boxplot(data$value ~ data$days)