使用ggplot2的线图中误差线的宽度 [英] Width of error bars in line plot using ggplot2
问题描述
我有一些带有标准错误的数据,并希望通过错误条显示这些数据。那就是我所拥有的:
I have some data with standard errors associated and would like to display these with error bars. That's what I have:
# generate some data
hod <- data.frame(h = c(1:24,1:24,1:24), mean = 1:(24*3) + runif(24*3, 0, 5),ci = runif(24*3, 0, 2), t = c(rep("a",24),rep("b",24),rep("c",24)))
pd <- position_dodge(0.3)
dayplot <- ggplot(hod, aes(x=h, y=mean, colour=as.factor(t),group=as.factor(t))) +
geom_line(position=pd, size=1) +
geom_errorbar(aes(ymin=mean-ci, ymax=mean+ci),
width=1,
size=0.5,
position=pd) +
geom_point(position=pd, shape=21, size=1, fill="white") +
scale_x_continuous(limits=c(-0.5,23.5),
breaks=c(0:8*3),
labels=ifelse(
c(0:8*3) < 10,
paste('0',c(0:8*3),':00',sep=''),
paste(c(0:8*3),':00',sep='')
)
) +
xlab("Hour of day") + ylab(ylabel) + labs(title = varlabels[var]) +
theme_minimal() +
theme(plot.margin = unit(c(1,0,1,1), "cm"),
axis.title.x = element_text(vjust=-1),
axis.title.y = element_text(angle=90, vjust=0),
legend.margin = unit(c(0), "cm"),
legend.key.height = unit(c(0.9), "cm"),
panel.grid.major = element_line(colour=rgb(0.87,0.87,0.87)),
panel.grid.minor = element_blank(),
plot.background = element_rect(fill = rgb(0.97,0.97,0.97), linetype=0)
)
唯一感兴趣的是可能是:
The only thing of interest is probably:
geom_errorbar(aes(ymin=mean-ci, ymax=mean+ci),
width=1,
size=0.5,
position=pd)
它给出:< img src = https://i.stack.imgur.com/4M6sY.png alt = all>
It gives:
现在,当我按因子变量( as.factor(t)
)对数据进行分组时,我得到了几行而不是一行,但是我想要的是,如您所见,误差条上的水平线更窄,我不知道为什么。我尝试更改甚至删除了 geom_errorbar $ c的
width
和 size
属性$ c>,但是什么也没有发生。是否有一种方法可以使每个图表的水平线宽度相同,而无论数据如何?我的意思是,为什么要有所不同?还是该宽度传达了一些信息?
Now when I group the data by a factor variable (as.factor(t)
), I get several lines instead of one, which is what I want, BUT, as you can see, the horizontal lines at the error bars are more narrow, and I can't figure out why. I tried changing and even taking away the width
and size
attribute of geom_errorbar
, but nothing happens. Is there a way to have the same width of the horizontal lines for every chart, no matter the data? I mean, why should it vary? Or does that width convey some information?
推荐答案
以下是使用随机数据的可复制示例。解决此问题的方法是将宽度乘以您拥有的类/因子的数量。在下面的图中,由于我使用了三个因素,因此使用3的宽度可以解决此问题。 ggplot2似乎是根据数据集中数据点的数量而不是x轴上的数值来计算相对宽度。这是(IMO)错误。
Below is a reproducible example using random data. The fix to the problem is to multiply the width by the number of classes/factors that you have. In the plot below, since I used three factors, using a width of 3 fixes the problem. ggplot2 seems to calculate the relative width by the number of data points in your dataset, rather than the numeric values on the x-axis. This is (IMO) a bug.
library(ggplot2)
library(grid)
#plot with factors
hod <- data.frame(h = c(1:24,1:24,1:24), mean = 1:(24*3) + runif(24*3, 0, 5),ci = runif(24*3, 0, 2), t = c(rep("a",24),rep("b",24),rep("c",24)))
pd <- position_dodge(0.3)
dayplot <- ggplot(hod, aes(x=h, y=mean, colour=as.factor(t),group=as.factor(t))) +
geom_line(position=pd, size=1) +
geom_errorbar(aes(ymin=mean-ci, ymax=mean+ci),
width=1,
size=0.5,
position=pd) +
geom_point(position=pd, shape=21, size=1, fill="white") +
scale_x_continuous(limits=c(-0.5,23.5),
breaks=c(0:8*3),
labels=ifelse(
c(0:8*3) < 10,
paste('0',c(0:8*3),':00',sep=''),
paste(c(0:8*3),':00',sep='')
)
) +
xlab("Hour of day") +
theme_minimal() +
theme(plot.margin = unit(c(1,0,1,1), "cm"),
axis.title.x = element_text(vjust=-1),
axis.title.y = element_text(angle=90, vjust=0),
legend.margin = unit(c(0), "cm"),
legend.key.height = unit(c(0.9), "cm"),
panel.grid.major = element_line(colour=rgb(0.87,0.87,0.87)),
panel.grid.minor = element_blank(),
plot.background = element_rect(fill = rgb(0.97,0.97,0.97), linetype=0)
)
print(dayplot)
#plot without factors
hod <- data.frame(h = c(1:24,1:24,1:24), mean = 1:(24) + runif(24, 0, 5),ci = runif(24, 0, 2))
pd <- position_dodge(0.3)
dayplot <- ggplot(hod, aes(x=h, y=mean)) +
geom_line(position=pd, size=1) +
geom_errorbar(aes(ymin=mean-ci, ymax=mean+ci),
width=1,
size=0.5,
position=pd) +
geom_point(position=pd, shape=21, size=1, fill="white") +
scale_x_continuous(limits=c(-0.5,23.5),
breaks=c(0:8*3),
labels=ifelse(
c(0:8*3) < 10,
paste('0',c(0:8*3),':00',sep=''),
paste(c(0:8*3),':00',sep='')
)
) +
xlab("Hour of day") +
theme_minimal() +
theme(plot.margin = unit(c(1,0,1,1), "cm"),
axis.title.x = element_text(vjust=-1),
axis.title.y = element_text(angle=90, vjust=0),
legend.margin = unit(c(0), "cm"),
legend.key.height = unit(c(0.9), "cm"),
panel.grid.major = element_line(colour=rgb(0.87,0.87,0.87)),
panel.grid.minor = element_blank(),
plot.background = element_rect(fill = rgb(0.97,0.97,0.97), linetype=0)
)
print(dayplot)
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