两个条形图中的条形高度以不同的“位置"聊天时，它们的高度是多少?代表? [英] What does the height of bars in the two bar chats with different "position" represents?

问题描述

我知道在此命令行中，条形的高度代表此变量颜色"中每个组的计数:

I know in this command line the height of the bars represents the count of each group in this variable "color":

ggplot(diamonds, aes(color, fill = cut)) +
  geom_bar()

但是我真的想知道这个命令行:

But I really wanna know what about this command line:

ggplot(diamonds, aes(color, fill = cut)) +
  geom_bar(alpha=0.5, position = "identity")

我知道前者默认为位置堆栈"，我也知道位置身份"的含义.但是我真的不知道后面的条形图的高度代表什么?

I know the former is defaulted as position "stack" and I also know the meaning of position "identity". But I really can't figure out what the height of the bars in the later one represents?

多谢了！

推荐答案

我认为理解它的最好方法是想象使用 position ='dodge'(其中会为不同的切割放置多个小节，按颜色分隔)，而是将所有剪切条彼此叠加.

I think the best way to understand it is to imagine using position='dodge' (which places multiple bars for different cuts, separated by color) and instead layering all the cut bars on top of each other.

ggplot(diamonds, aes(color, fill = cut)) +
  geom_bar(alpha=0.5, position = "dodge")

ggplot(diamonds, aes(color, fill = cut)) +
  geom_bar(alpha=0.5, position = "identity")

(请注意，由于公平"裁切位于前面，因此颜色会失真.)

(Note, the colors get distorted because the 'Fair' cut is in front.)

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