使用facet_wrap和兩個變量在R中訂購條形圖

Question

我的意圖是使用ggplot2和facet_wrap繪制2張圖表“長期”和“非常長期”失業。 我希望訂單通過indic ==“LTU”（facet_wrap的頂部）升序，所以在頂部圖表中“LU”和“MT”不在右側。 但我沒有管理ggplot正確訂購酒吧。 有什么建議？

可重復的例子：

library(tidyverse)
library(eurostat)

#Long-term unemployment by sex - quarterly average 
une_ltu_q <- get_eurostat("une_ltu_q", stringsAsFactors=FALSE)


df <- une_ltu_q %>% filter(age=="Y15-74",
                          geo %in% c("EU28", "BE","BG","CZ","DK","DE","EE","IE","EL","ES","FR","HR","IT","CY","LV","LT","LU","HU","MT","NL","AT","PL","PT","RO","SI","SK","FI","SE","UK"),
                          sex=="T",
                          s_adj=="SA",
                          time==max(une_ltu_q$time), 
                          unit=="PC_ACT")%>% 
        group_by(indic_em)%>% arrange()



ggplot(data=df, aes(x=reorder(geo, values), y=values))+
        geom_bar(stat = "identity", 
                 position = "dodge", 
                 show.legend = FALSE,
                 fill="steelblue")+
        geom_text(aes(label=values), vjust=-0.5, size=3.5)+
        facet_wrap(~indic_em, ncol=1, scales = "free")

Answer 1

reorder有一個FUN ction參數，您可以使用它來更改排序。 默認情況下，您的示例按兩個值的mean排序。 但你也可以只取第一個值：

ggplot(data=df, aes(x=reorder(geo, values, "[", 1), y=values))+
  geom_bar(stat = "identity", 
           position = "dodge", 
           show.legend = FALSE,
           fill="steelblue")+
  geom_text(aes(label=values), vjust=-0.5, size=3.5)+
  facet_wrap(~indic_em, ncol=1, scales = "free")

或者sum ：

ggplot(data=df, aes(x=reorder(geo, values, sum, na.rm=T), y=values))+
  geom_bar(stat = "identity", 
           position = "dodge", 
           show.legend = FALSE,
           fill="steelblue")+
  geom_text(aes(label=values), vjust=-0.5, size=3.5)+
  facet_wrap(~indic_em, ncol=1, scales = "free")

Answer 2

使用以下代碼： https ： //github.com/dgrtwo/drlib/blob/master/R/reorder_within.R

我們可以使用這些函數在組內重新排序，這樣每個方面都會有升序條。 下面是集成這些功能的修改后的ggplot代碼。

reorder_within <- function(x, by, within, fun = mean, sep = "___", ...) {
  new_x <- paste(x, within, sep = sep)
  stats::reorder(new_x, by, FUN = fun)
}

scale_x_reordered <- function(..., sep = "___") {
  reg <- paste0(sep, ".+$")
  ggplot2::scale_x_discrete(labels = function(x) gsub(reg, "", x), ...)
}


ggplot(data=df, aes(x=reorder_within(geo, values, indic_em), y=values))+
geom_col(stat = "identity", 
position = "dodge", 
show.legend = FALSE,
fill="steelblue")+
geom_text(aes(label=values), vjust=-0.5, size=3.5)+
scale_x_reordered()+
facet_wrap(~indic_em, ncol=1, scales = "free")