r - geom_density()图中的多个组

我正在尝试在一个geom_density()图中绘制3个组。

数据为长格式:

MEI Count   Region
-2.031  10  MidWest
-1.999  0   MidWest
-1.945  15  MidWest
-1.944  1   MidWest
-1.875  6   MidWest
-1.873  10  MidWest
-1.846  18  MidWest

Region是变量，因此也有一个South和NorthEast值，代码如下:

ggplot(d, aes(x=d$MEI, group=d$region)) +
  geom_density(adjust=2) +
  xlab("MEI") +
  ylab("Density")

更近一步

最佳答案

请尝试以下操作:

ggplot() +
  geom_density(data=ddf, aes(x=MEI, group=Region, fill=Region),alpha=0.5, adjust=2) +
  xlab("MEI") +
  ylab("Density")

如果您只想要颜色而没有填充:

ggplot() +
  geom_density(data=ddf, aes(x=MEI, group=Region, color=Region), adjust=2) +
  xlab("MEI") +
  ylab("Density")+
  theme_classic()

此处使用以下数据:

dput(ddf)
structure(list(MEI = c(-2.031, -1.999, -1.945, -1.944, -1.875,
-1.873, -1.846, -2.031, -1.999, -1.945, -1.944, -1.875, -1.873,
-1.846, -2.031, -1.999, -1.945, -1.944, -1.875, -1.873, -1.846,
-2.031, -1.999, -1.945, -1.944, -1.875, -1.873, -1.846), Count = c(10L,
0L, 15L, 1L, 6L, 10L, 18L, 10L, 0L, 15L, 1L, 6L, 10L, 0L, 15L,
10L, 0L, 15L, 1L, 6L, 10L, 10L, 0L, 15L, 1L, 6L, 10L, 18L), Region = c("MidWest",
"MidWest", "MidWest", "MidWest", "MidWest", "MidWest", "MidWest",
"South", "South", "South", "South", "South", "South", "South",
"South", "South", "South", "NorthEast", "NorthEast", "NorthEast",
"NorthEast", "NorthEast", "NorthEast", "NorthEast", "NorthEast",
"NorthEast", "NorthEast", "NorthEast")), .Names = c("MEI", "Count",
"Region"), class = "data.frame", row.names = c(NA, -28L))

 ddf
      MEI Count    Region
1  -2.031    10   MidWest
2  -1.999     0   MidWest
3  -1.945    15   MidWest
4  -1.944     1   MidWest
5  -1.875     6   MidWest
6  -1.873    10   MidWest
7  -1.846    18   MidWest
8  -2.031    10     South
9  -1.999     0     South
10 -1.945    15     South
11 -1.944     1     South
12 -1.875     6     South
13 -1.873    10     South
14 -1.846     0     South
15 -2.031    15     South
16 -1.999    10     South
17 -1.945     0     South
18 -1.944    15 NorthEast
19 -1.875     1 NorthEast
20 -1.873     6 NorthEast
21 -1.846    10 NorthEast
22 -2.031    10 NorthEast
23 -1.999     0 NorthEast
24 -1.945    15 NorthEast
25 -1.944     1 NorthEast
26 -1.875     6 NorthEast
27 -1.873    10 NorthEast
28 -1.846    18 NorthEast
>

由于所有3个因子的密度相同，因此Graph只给出一条曲线，并带有来自https://dl.dropboxusercontent.com/u/16400709/StackOverflow/DataStackGraph.csv的数据。

> with(dfmain, tapply(MEI, Region, mean))
  MidWest Northeast     South
0.1717846 0.1717846 0.1717846
>
> with(dfmain, tapply(MEI, Region, sd))
  MidWest Northeast     South
 1.014246  1.014246  1.014246
>
> with(dfmain, tapply(MEI, Region, length))
  MidWest Northeast     South
      441       441       441

关于r - geom_density()图中的多个组，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/26075181/