在 ggplot2 中,在具有多个自变量的数据中跨 Facets 生成误差条

In ggplot2, generate error bars across Facets in a data with multiple independent variables

我正在尝试将误差条放在数据框的平均值上,该数据框具有三个自变量并绘制为 facet_grid。但是,下面的图将错误栏放在了错误的方面。谁能帮帮我?

请参阅下面的示例数据和相关代码:

life <- rep(c("1d", "2d", "4d"), 2, each = 2)
trt <- rep(c("c1", "c2"), 6)
species <- rep(c("SP1", "SP2"), each = 6)
mean_v <- runif(12, 12, 45)
sem_v <- runif(12, 1, 4)
data1 <- data.frame(life, trt, species, mean_v, sem_v)
plot1 <- ggplot(data1, aes(x = trt, y = mean_v, group = species, fill = species))
plot1 + geom_bar(stat = "identity", position = "dodge") + 
        facet_grid(~life) + 
        geom_errorbar(aes(ymin = data1$mean_v - data1$sem_v, 
                          ymax = data1$mean_v + data1$sem_v, 
                          width = 0.2),
                      position = position_dodge(width = 0.90), 
                      group = data1$trt)

非常感谢。

解决方案似乎是在 geom_bargeom_errorbar 中指定 position=position_dodge(width=0.9)

library(ggplot2)

plot1 <- ggplot(data1, aes(x=trt, y=mean_v, group=species, fill=species)) +
         geom_bar(stat="identity", position=position_dodge(width=0.9)) + 
         facet_grid(. ~ life) + 
         geom_errorbar(aes(ymin=mean_v - sem_v, ymax=mean_v + sem_v), 
                       width=0.2, position=position_dodge(width=0.9))

ggsave("dodged_barplot.png", plot=plot1, height=4, width=6, dpi=150)