传说ggplot2和geom_point

Question

我正在尝试使用ggplot2和geom_point创建一个图例.我有一个看起来像这样的数据框

d <- data.frame(variable = c("A", "B", "C", "D", "E", "F", "G", "H", "I", "J"),
            value = rnorm(10, 3),
            Schoolave = rnorm(10, 3),
            districtave = rnorm(10, 3),
            max = rnorm(10, 3),
            min = rnorm(10, 3))

我想制作一个看起来像这样的情节.

plot <- ggplot(data = d, aes(x = variable, y = value)) + geom_errorbar(ymax = d$max, ymin = d$min) 

plot <- plot + coord_flip() 
plot <- plot + geom_point(data = d, aes(x = variable, y = value), 
                                                shape = 1, size = 5)
plot <- plot + geom_point(data = d, aes(x = variable, y = districtave), shape = 0, size = 4)
plot <- plot + geom_point(data = d, aes(x = variable, y = Schoolave), shape = 2, size = 3)
plot <- plot + theme_bw() + theme(legend.position= "bottom") 
plot

我想要一个传奇,告诉他们你的平均得分的圆圈.三角形是您学校的平均分数.广场是该地区的平均值.我找了办法做到这一点找不到办法.任何帮助,将不胜感激.

Answer 1

ggplot 喜欢整洁的数据,这意味着你必须将数据融化成长格式.

library(reshape2)
d.points = melt(d[, c("variable", "value", "Schoolave", "districtave")],
                id = "variable",
                variable.name = "type")

现在您的数据有一个我们将映射到的列shape,因此自动图例将起作用.并且无需添加到同一个绘图并将其保存在每一行中,只需一次添加即可.请不要指定data$column内部aes()!如果您想要刻面或进行更高级的绘图,它将导致问题.您可以预先指定数据,因此您不必再在内部说出来aes().而且不要使用aes()您所有的审美映射,如errorbar的最小值和最大值.

plot <- ggplot(data = d, aes(x = variable, y = value)) + 
    geom_errorbar(aes(ymax = max, ymin = min)) +
    coord_flip() +
    geom_point(data = d.points,
               aes(x = variable, y = value, shape = type),
               size = 5) +
    scale_shape_manual(values = 1:3, name = "") +
    theme_bw() + 
    theme(legend.position= "bottom") 
plot

如果您想要更好的标签,可以在形状比例中指定它们.在水平传说中,我想添加一个小空格,如下所示:

scale_shape_manual(values = 1:3, name = "",
                   labels = c("Individual Average  ", "School Average  ", "District Average  ")) +