如何调整R语言ggplot堆叠直方图的堆叠位置？

Hey there! Let's fix up that histogram stacking to match your target style. The default behavior of geom_histogram with a fill aesthetic stacks bars on top of one another, but we can tweak the position parameter to get the layout you want. Here are the two most common adjustments:

1. Side-by-Side (Dodged) Bars #

If you want bars for each income group to sit next to each other instead of stacking, use position_dodge(). Adding preserve = "single" ensures bars stay the same width even if some age groups only have one income category:

ggplot(adult, aes(age, fill = income)) +
  geom_histogram(color = 'black', binwidth = 1, position = position_dodge(preserve = "single")) +
  theme_bw()

2. Percentage Stacked Bars #

If you want each age group's bar to span 100% height (showing the proportion of each income group per age), use position_fill(). We'll also update the y-axis label to make it clear it's showing percentages:

ggplot(adult, aes(age, fill = income)) +
  geom_histogram(color = 'black', binwidth = 1, position = position_fill()) +
  theme_bw() +
  ylab("Percentage")

If your target style is something else (like a reversed stack or a custom offset), feel free to share more details, and we can refine the code further!

内容的提问来源于stack exchange，提问作者Abhishek Pokhrel