在一个分面ggplot条形图中y实验室的百分比? [英] percentage on y lab in a faceted ggplot barchart?
问题描述
例如
test1< - sample(letters [1: 2],100,replace = T)
test2< - sample(letters [3:8],100,replace = T)
test< - data.frame(cbind(test1,test2) )
ggplot(test,aes(test2))+ geom_bar()+ facet_grid(〜test1)
这很容易,但如果方面A中的N与方面B相比不同,那么我认为比较百分比会更好,这样每个方面的总和就达到100%。
你会怎么做到这一点?
希望我的问题有道理。
此致
试试这个:
#首先创建一个频率为
df < - as.data.frame(with(test,table(test1,test2)))
#或与来自plyr软件包的count()一样,Hadley建议
df< - count(test,vars = c('test1','test2'))
#next:每个组的计算百分比
df < - ddply(df,。(test1),transform,p = Freq / sum(Freq))
#和plot
ggplot(df,aes(test2,p))+ geom_bar + facet_grid(〜test1)
您也可以添加 + scale_y_continuous(formatter =percent)
到版本0.9.9的 ggplot2 版本或 + scale_y_continuous(labels = percent_format())
的图。
doing facets in ggplot I would often like the percentage to be used instead of counts.
e.g.
test1 <- sample(letters[1:2], 100, replace=T)
test2 <- sample(letters[3:8], 100, replace=T)
test <- data.frame(cbind(test1,test2))
ggplot(test, aes(test2))+geom_bar()+facet_grid(~test1)
This is very easy but if N is different in facet A compared to facet B, it would be better I think, to compare percentages, in such a way that the each facet sums to 100%.
how would you achieve this?
Hope my question makes sense.
Sincerely.
Try this:
# first make a dataframe with frequencies
df <- as.data.frame(with(test, table(test1,test2)))
# or with count() from plyr package as Hadley suggested
df <- count(test, vars=c('test1', 'test2'))
# next: compute percentages per group
df <- ddply(df, .(test1), transform, p = Freq/sum(Freq))
# and plot
ggplot(df, aes(test2, p))+geom_bar()+facet_grid(~test1)
You could also add + scale_y_continuous(formatter = "percent")
to the plot for ggplot2 version 0.8.9, or + scale_y_continuous(labels = percent_format())
for version 0.9.0.
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