R中用于因子数据的箱线图

如果'y'变量为，可能会发生这种情况factor。将其转换为numericfrom factor，它应该可以工作

happiness$Happiness.Score <- as.numeric(as.character(happiness$Happiness.Score))
ggplot(data=happiness, mapping = aes(x = Region, y = Happiness.Score))  + 
               geom_boxplot()

可重现的示例

data(iris)
ggplot(data = iris, mapping = aes(x = Species, y = Sepal.Length)) + 
      geom_boxplot()

现在，用“ Sepal.Length”作为 factor

ggplot(data = iris, mapping = aes(x = Species, y = factor(Sepal.Length))) + 
           geom_boxplot()