在ggplot中繪制置信區間

Question

我想用ggplot做下面的情節：

這是我的df結構的一個例子（有點，不按比例繪制數據）：

example.df = data.frame(mean = c(0.3,0.8,0.4,0.65,0.28,0.91,0.35,0.61,0.32,0.94,0.1,0.9,0.13,0.85,0.7,1.3), 
                            std.dev = c(0.01,0.03,0.023,0.031,0.01,0.012,0.015,0.021,0.21,0.13,0.023,0.051,0.07,0.012,0.025,0.058),
                            class = c("1","2","1","2","1","2","1","2","1","2","1","2","1","2","1","2"),
                            group = c("group1","group2","group1","group2","group1","group2","group1","group2","group1","group2","group1","group2","group1","group2","group1","group2"))

該數據框由16個重復組成，每個重復具有給定的平均值和給定的標准偏差。

對於每個復制，我想繪制置信區間，其中我的圖例中的大點是平均估計值，條形的長度是標准偏差的兩倍。

此外，我想在同一行中繪制兩個不同的重復，但具有不同的着色，按類着色，紅色為1級，藍色為2級。

最后，我想將整個繪圖分成兩個面板（在同一行中），對應於兩個不同的組。

我試着查看這個網站http://www.cookbook-r.com/Graphs/Plotting_means_and_error_bars_(ggplot2)/但是無法弄清楚如何為這個結構的任何數據框自動化這個，有X個組（在這種情況下2），K每組重復（在這種情況下，類別1中的8,4，類2和4）。

有沒有一種使用ggplot或標准r pkg庫的好方法？

Answer 1

我假設您提供的示例數據框架沒有以適當的方式構建，因為group1所有值都具有class 1 ，而group2所有值都是類2 。 所以我創建了新的數據框，還添加了一個名為replicate新列，它顯示了每個group的重復次數（四次重復（包含兩個class值））。

example.df = data.frame(mean = c(0.3,0.8,0.4,0.65,0.28,0.91,0.35,0.61,0.32,0.94,0.1,
                                0.9,0.13,0.85,0.7,1.3), 
                        std.dev = c(0.01,0.03,0.023,0.031,0.01,0.012,0.015,0.021,0.21,
                                  0.13,0.023,0.051,0.07,0.012,0.025,0.058),
                        class = c("1","2","1","2","1","2","1","2","1","2","1",
                                 "2","1","2","1","2"),
                        group = rep(c("group1","group2"),each=8),
                        replicate=rep(rep(1:4,each=2),time=2))

現在，您可以使用geom_pointrange()來獲取具有置信區間的點和facet_wrap()來為每個組創建繪圖。

ggplot(example.df,aes(factor(replicate),
               y=mean,ymin=mean-2*std.dev,ymax=mean+2*std.dev,color=factor(class)))+
  geom_pointrange()+facet_wrap(~group)