躲避误差线和点以避免重叠答案

【问题标题】：Dodge error bars and points to avoid overlap躲避误差线和点以避免重叠
【发布时间】：2014-04-07 15:43:29
【问题描述】：

我正在尝试修复错误栏，以便它们在我的图表上实际上是可读的。唯一引起问题的是 2013 年的数据。我该怎么做呢？我看到了一些关于抖动或闪避的帖子，但我不确定如何应用它来解决我的问题。

这是我试图修改的代码：

YearlyDensity <- read.table(header=T, text='
Station Year       mean           se
   M-25 2013   8944.444     3636.871
   M-25 2008       4212         2371
   M-25 2004        963          291
   M-45 2013   8495.169     2111.072
   M-45 2008      13023         1347
   M-45 2004       8748         1740
    X-2 2013  12345.411     1166.905
')    

library(ggplot2)
ggplot(YearlyDensity, aes(x=Year, y=mean, colour=Station,group=Station)) +
  geom_errorbar(aes(ymin=mean-se, ymax=mean+se), colour="black", width=.2) +
  geom_line(size=.8) +
  geom_point(size=4, shape=18) +
  coord_cartesian(ylim = c(0, 16000)) +
  scale_y_continuous(breaks=seq(0,16000,2000)) +
  xlab("Sampling Year") +
  ylab("Mean Density") +
  labs(fill="") +
  theme_bw() +
    theme(legend.justification=c(1,0), legend.position=c(1,0))

【问题讨论】：

标签： r ggplot2 errorbar

【解决方案1】：

您可以将所有geoms 的dodgewidth 设置为相同的值，即将position = position_dodge(width = <the-desired-width>) 添加到每个position = position_dodge(width = <the-desired-width>)。详情请见What is the width argument in position_dodge?。

# set desired dodge width
pd <- position_dodge(width = 0.4)

ggplot(YearlyDensity, aes(x = Year, y = mean, colour = Station, group = Station)) +
  geom_errorbar(aes(ymin = mean-se, ymax = mean+se),
                colour = "black", width = 0.2, position = pd) +
  geom_line(size = .8, position = pd) +
  geom_point(size = 4, shape = 18, position = pd) +
  coord_cartesian(ylim = c(0, 16000)) +
  scale_y_continuous(breaks = seq(0, 16000, 2000)) +
  xlab("Sampling Year") +
  ylab("Mean Density") +
  labs(fill = "") +
  theme_bw() +
  theme(legend.justification = c(1, 0), legend.position = c(1, 0))

【讨论】：