r - 使用 geom_segment 按因素分组数据

Question

我想使用 geom_segment 按因子组显示段簇，但 position 参数似乎没有任何作用。这是一个例子:

mydata = data.frame(variable = factor(c("A","A","A","B","C")),
                    color = factor(c(1,2,3,4,5)),
                    start = c(1,2,1,4,6),
                    end = c(3,4,6,5,8))

ggplot(mydata, aes(x = start, xend = end, y = variable, yend = variable)) + 
  geom_segment(aes(color = color, position = "stack"), size = 3)

我也尝试过 position = "dodge"。 A 组应该有 3 个部分，但它们都被绿色条遮住了。调整透明度会在视觉上过于困惑。如何确保每个因素的所有分割都并排显示？

Answer 1

我有点不确定@alistaire 和我是否清楚地向您传达了这一点，所以我们的意思是:

mydata = data.frame(variable = factor(c("A","A","A","B","C")),
                                        color = factor(c(1,2,3,4,5)),
                                        start = c(1,2,1,4,6),
                                        end = c(3,4,6,5,8))

ggplot(mydata, aes(ymin = start, ymax = end, x = variable)) + 
    geom_linerange(aes(color = color),position = position_dodge(width = 0.2), size = 3) + 
    coord_flip()

结果是: