带错误条的ggplot发散线

Question

我想绘制从参考点'a'到其他点(例如'b','c','d'等)的图形线,

数据:

df <- structure(list(value = c(1.40438297796257, 1.44036790976986, 
1.37704383251482, 1.45355096018748, 1.40847559339844, 1.38860635968641, 
1.43714387291229), group = c("a", "b", "c", "d", "e", "f", "g"
), low = c(1.38956448514689, 1.40198829989962, 1.33523395978584, 
1.42008027933896, 1.37516232159193, 1.34823916425279, 1.397985577859
), up = c(1.41920147077825, 1.4787475196401, 1.4188537052438, 
1.487021641036, 1.44178886520494, 1.42897355512002, 1.47630216796558
), sem = c(0.00757411399256711, 0.0120426947992103, 0.0137959906464809, 
0.00953361452671253, 0.00945315870421568, 0.0130586010600045, 
0.0124407008862053)), .Names = c("value", "group", "low", "up", 
"sem"), row.names = c(NA, -7L), class = "data.frame")

码:

library('ggplot2')
ggplot( df, aes( x = group, y = value, group = 1 ) ) +
  geom_line( size = 1 ) +
  geom_errorbar( width=.2, size = 1, aes( ymin = low, ymax = up ), colour="black") +
  geom_errorbar( width=.2, size = 1, 
                 aes( ymin = value - sem, ymax = value + sem ),
                 colour="red") +
  geom_point( shape = 21, size = 4, fill="white")

当前情节:

预期情节:

Answer 1

不知道为什么你这样做group = 1但你需要groupvar来分隔线条.在这里,我创建了与第一个数据点相同的虚拟数据点,与每个数据点位于同一组.请注意,如果您计划使用透明度,这将导致问题,并需要进一步摆弄.

df = rbind(df[rep(1,5),],df)

df$lineGroup = c(1:6,1:6)

ggplot( df, aes( x = group, y = value, group = lineGroup ) ) +
    geom_line( size = 1 ) +
    geom_errorbar( width=.2, size = 1, aes( ymin = low, ymax = up ), colour="black") +
    geom_errorbar( width=.2, size = 1, 
                   aes( ymin = value - sem, ymax = value + sem ),
                   colour="red") +
    geom_point( shape = 21, size = 4, fill="white")

透明度问题

如果你这样做

ggplot( df, aes( x = group, y = value, group = lineGroup ) ) +
    geom_line( size = 1 ) +
    geom_errorbar( width=.2, size = 1, aes( ymin = low, ymax = up ), colour="black",alpha=.3) +
    geom_errorbar( width=.2, size = 1, 
                   aes( ymin = value - sem, ymax = value + sem ),
                   colour="red",alpha =.3) +
    geom_point( shape = 21, size = 4, fill="white")

由于存在多个数据点,您会看到第一个点更暗

要摆脱这种情况,您需要aes通过添加控制可见性的列来控制透明度.

 df$alpha = c('visible', rep('hidden',5), rep('visible',6))

ggplot( df, aes( x = group, y = value, group = lineGroup ) ) +
    geom_line( size = 1 ) +
    geom_errorbar( width=.2, size = 1, aes( ymin = low, ymax = up,alpha= alpha ), colour="black") +
    geom_errorbar( width=.2, size = 1, 
                   aes( ymin = value - sem, ymax = value + sem,alpha=alpha),
                   colour="red") +
    scale_alpha_manual(name='',values  = c('visible' = 0.3,'hidden' = 0)) + 

    geom_point(aes(), shape = 21, size = 4, fill="white")