R 如何在ggplot2森林图中添加簇水平线？

我很快就要完成一个概要森林图了。下面包括代码和绘图图像。最后一个很好的步骤是将某些行聚集在一起。例如，第1年至第4年的酒吧应该聚集在一起，用一个空格将其与“total”和“Male”分开。基本上，所有相同颜色的酒吧应该聚集在一起，并与其他酒吧分开。我已经为此挣扎了几个小时。有什么想法吗？我制作了数据来创建这个示例图，包含在下面的代码中

library(ggplot2)

#MADE UP DATA
test <- data.frame(
x = c("one", "two", "three","four", "five", "six","seven", "eight", "nine","ten",     "eleven", "twelve","thirteen", "fourteen"),
y   = c(4.0, 4.4, 7.1, 8.2, 2.9, 3.0, 4.0,  9.0, 11.0,  7.6, 4.4, 4.6, 4.9, 5.0 ),
yhi = c(6.0, 4.8, 7.6, 8.4, 3.3, 3.1, 4.8, 10.0, 16.0, 8.0, 4.5, 5.0, 6.9, 5.7), 
ylo = c(2.0, 4.2, 6.6, 8.0, 2.5, 2.9, 3.2,  8.0,  6.0, 7.2, 4.3, 4.2, 2.9, 4.3), 
labpos = c(17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17), 
lab = c("total","Year1","Year2","Year3","Year4","Male","Female","Infant","Child","Adult","Urban","Rural","Occupational","Non-Occupational"), 
grouping = factor(c(1,2,2,2,2,3,3,4,4,4,5,5,6,6)))


test$x <- reorder(test$x, c(14,13,12,11,10,9,8,7,6,5,4,3,2,1))



# MAKE INITIAL PLOT
a <- ggplot(test, aes(x=x, y=y, ymin=ylo, ymax=yhi, colour=grouping)) +  geom_pointrange(shape=15, size=1.2, position=position_dodge(width=c(0.1))) + coord_flip() + geom_hline(aes(x=0), lty=2) + xlab('Variable') + scale_x_discrete(breaks=NULL) + scale_y_continuous(limits = c(-1,26)) + theme_bw() 


# ADD AXIS LABELS3
a <- a + ylab("Blood lead level (ug/dL)") + xlab("") + ggtitle("Meta-Analysis Summary") + theme(legend.position="none")

# ADD LABELS FOR EACH POINT/CI
a + geom_text(data=test, aes(x = x, y = labpos, label = lab, hjust=0, fontface="italic")) 

库（ggplot2）
#编造数据
测试根据用户20650的建议解决了这个问题。
根据本网站的建议：

您需要添加缺少数据的行，以便在组之间留出空间。例如，对于我的合成数据集：

test3 <- data.frame(
x = c("one", "two", "three","four", "five", "six","seven", "eight", "nine","ten", "eleven", "twelve","thirteen", "fourteen", "fifteen"),
y   = c(4.0, NA, 4.4, 7.1, 8.2, 2.9, 3.0, 4.0,  9.0, 11.0,  7.6, 4.4, 4.6, 4.9, 5.0 ),
yhi = c(6.0, NA,  4.8, 7.6, 8.4, 3.3, 3.1, 4.8, 10.0, 16.0,  8.0, 4.5, 5.0, 6.9, 5.7), 
ylo = c(2.0, NA, 4.2, 6.6, 8.0, 2.5, 2.9, 3.2,  8.0,  6.0,  7.2, 4.3, 4.2, 2.9, 4.3), 
labpos = c(17, NA, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17), 
lab = c("total", "",   "Year1","Year2","Year3","Year4","Male","Female","Infant","Child","Adult","Urban","Rural","Occupational","Non-Occupational"), 
grouping = factor(c(1,1,2,2,2,2,3,3,4,4,4,5,5,6,6)))

test3$x <- reorder(test3$x, c(15,14,13,12,11,10,9,8,7,6,5,4,3,2,1))

test3
facet\u grid（grouping~）
？因此我尝试了facet\u grid（根据您的建议），不幸的是，它将六个组/颜色中的每一个都放在了单独的图中。在同一个情节中，有没有一种“刻面”的方式？我知道这听起来可能很愚蠢，这篇文章可能有助于重新分组-大约在页面的一半。。我明白你的意思。我来试试，谢谢！我将用这个解决方案回答我自己的帖子。谢谢这是一篇很棒的帖子，谢谢你分享你的解决方案。我现在正在用你的代码试着画一个图，但我想要不同的颜色。我试过秤填充手动代码，但它不适合我。你知道有什么帖子，网站，信息可以教我怎么做吗？谢谢！：）