与bwplot分组的水平箱图

Question

我有以下代码,允许通过bwplot函数的分组垂直框图lattice.可重复的例子..

data(mpg, package = "ggplot2") 

bwplot( hwy~class, data = mpg, groups = year,
    pch = "|", box.width = 1/3,
    auto.key = list(points = FALSE, rectangles = TRUE, space = "right"),
    panel = panel.superpose,
    panel.groups = function(x, y, ..., group.number) {
        panel.bwplot(x + (group.number-1.5)/3, y, ...)
     })

这工作正常,但我希望箱图是水平的,所以我改变了第一行,保持其他一切相等:

bwplot( class~hwy, data = mpg, groups = year, ...

但图表就是这样出来的 .我试过玩代码没有成功.我有两个问题:首先,我怎么能,或者是否可以让箱图不相互叠加？其次,更一般地说,如何将颜色面板设置为灰度,因此情节会以灰色或黑白色调出现？

Answer 1

• 您还应该在panel.groups函数中反转x和y角色.
• 使用trellis.par.set改变叠加符号的填充色

data(mpg, package = "ggplot2") 
library(latticeExtra)
mycolors <- grey.colors(5, start = 0.1, end = 0.9)
trellis.par.set(superpose.symbol = list(fill = mycolors,col=mycolors))
bwplot(class~hwy, data = mpg, groups = year,
                pch = "|", box.width = 1/3,
                panel = panel.superpose,
                panel.groups = function(x, y,..., group.number) 
                    panel.bwplot(x,y + (group.number-1.5)/3,...)
            ) 

但是这里使用ggplot2解决方案可能更容易.

Answer 2

如果您使用的并不重要bwplot，您可以尝试ggplot：

ggplot(data = mpg, aes(x = class, y = hwy, fill = factor(year))) +
  geom_boxplot() +
  coord_flip() +
  scale_fill_grey(start = 0.5, end = 0.8) +
  theme_classic()