ggplot2小提琴情节：只填满中央95％？

Question

GGPLOT2可以创建一个非常有吸引力的填充小提琴情节：

ggplot() + geom_violin(data=data.frame(x=1, y=rnorm(10^5)), 
    aes(x=x, y=y), fill='gray90', color='black') + 
    theme_classic() 

我想填充限制分配如果可能的中央95％，剩下的外形完整无缺。有没有人有如何完成这一建议？

Answer 1

这是做你想做的吗？它需要一些数据处理和两把小提琴的绘制。

set.seed(1) 
dat <- data.frame(x=1, y=rnorm(10^5)) 

#calculate for each point if it's central or not 
dat_q <- quantile(dat$y, probs=c(0.025,0.975)) 
dat$central <- dat$y>dat_q[1] & dat$y < dat_q[2] 

#plot; one'95' violin and one 'all'-violin with transparent fill. 
p1 <- ggplot(data=dat, aes(x=x,y=y)) + 
    geom_violin(data=dat[dat$central,], color="transparent",fill="gray90")+ 
    geom_violin(color="black",fill="transparent")+ 

    theme_classic() 

编辑：圆边困扰着我，所以这里是第二种方法。如果我这样做，我会想要直线。所以我做了一些演奏与密度（这是小提琴地块是基于）

d_y <- density(dat$y) 

right_side <- data.frame(x=d_y$y, y=d_y$x) #note flip of x and y, prevents coord_flip later 
right_side$central <- right_side$y > dat_q[1]&right_side$y < dat_q[2] 

#add the 'left side', this entails reversing the order of the data for 
#path and polygon 
#and making x negative 
left_side <- right_side[nrow(right_side):1,] 
left_side$x <- 0 - left_side$x 

density_dat <- rbind(right_side,left_side) 


p2 <- ggplot(density_dat, aes(x=x,y=y)) + 
    geom_polygon(data=density_dat[density_dat$central,],fill="red")+ 
    geom_path() 


p2 

Answer 2

只是做一个选择第一。概念证明：

df1 <- data.frame(x=1, y=rnorm(10^5)) 
df2 <- subset(df1, y > quantile(df1$y, 0.025) & y < quantile(df1$y, 0.975)) 

ggplot(mapping = aes(x = x, y = y)) + 
    geom_violin(data = df1, aes(fill = '100%'), color = NA) + 
    geom_violin(data = df2, aes(fill = '95%'), color = 'black') + 
    theme_classic() + 
    scale_fill_grey(name = 'level')