[R] Using ggplot2 to plot percentages in bar chart.
Jeff Newmiller
jdnewmil at dcn.davis.ca.us
Tue Dec 6 07:12:48 CET 2016
I don't understand how your labelling technique was supposed to work.
Below is my reproducible example of how I would approach this problem.
When you post next time, try to follow this method of making something we
can put into our fresh R environment and see your problem directly.
---
library(dplyr)
library(tidyr)
library(ggplot2)
dta <- read.table( text=
" MASTERPAK2LT MASTERPAK4LT MASTERPAK7LT MASTERPAK10LT MASTERPAK22LT
1 X X X X X
2 C C C X X
3 C C C X X
4 U U X X X
5 NA U X X X
6 NA NA X NA NA
", header=TRUE, as.is=TRUE )
d2 <- dta %>%
gather( Model, Status ) %>%
group_by( Model, Status ) %>%
summarise( count = n() ) %>%
group_by( Model ) %>%
mutate( perc = 100 * count / sum( count )
, percpos = rev( cumsum( rev( perc ) ) - 0.5 * rev( perc ) )
) %>%
ungroup %>%
mutate( Modelf = factor( Model )
, percLbl = sprintf( "%2.0f%%", perc )
)
plt <- ggplot( d2
, aes( x = Modelf
, y = perc
, fill = Status
)
) +
geom_bar( stat = "identity" ) +
labs( x = "Model", y = "Percent Complete" ) +
geom_text( mapping = aes( x = Modelf
, y = percpos
, label = percLbl )
, vjust = 0.5 )
plt
---
On Mon, 5 Dec 2016, Shawn Way wrote:
> That?s precisely what I?m trying to accomplish.
>
> Shawn Way, PE
>
> From: John Kane [mailto:jrkrideau at yahoo.ca]
> Sent: Monday, December 05, 2016 4:47 PM
> To: Shawn Way <SWay at meco.com>; r-help at r-project.org
> Subject: Re: [R] Using ggplot2 to plot percentages in bar chart.
>
> I've never seen stat_bin used like that. What exactly is it supposed to do. It looks like you are trying to label the %ages in each piece of the bar.
>
> On Monday, December 5, 2016 2:17 PM, Shawn Way <SWay at meco.com<mailto:SWay at meco.com>> wrote:
>
> I have the following data in which I'm trying to summarize in a stacked bar plot showing the percentages as a label in the bar.
>
> The data is as follows:
>
>> head(data)
> MASTERPAK2LT MASTERPAK4LT MASTERPAK7LT MASTERPAK10LT MASTERPAK22LT
> 1 X X X X X
> 2 C C C X X
> 3 C C C X X
> 4 U U X X X
> 5 <NA> U X X X
> 6 <NA> <NA> X <NA> <NA>
>
> It is then transformed using dplyer:
>
>> d2 <- data %>%
> gather(Model,Status) %>%
> group_by(Model,Status) %>%
> summarise(count=n()) %>%
> mutate(perc=count/sum(count))
>
> giving
>> head (d2)
> Source: local data frame [6 x 4]
> Groups: Model [2]
>
> Model Status count perc
> <chr> <chr> <int> <dbl>
> 1 MASTERPAK10LT C 8 0.21052632
> 2 MASTERPAK10LT X 29 0.76315789
> 3 MASTERPAK10LT <NA> 1 0.02631579
> 4 MASTERPAK22LT C 6 0.15789474
> 5 MASTERPAK22LT U 1 0.02631579
> 6 MASTERPAK22LT X 30 0.78947368
>
> I then try to plot this using ggplot using
>
> plt <- ggplot(d2,aes(x=Model,y= perc,fill=Status)) +
> geom_bar(stat="identity") +
> labs(y="Percent Complete") +
> stat_bin(geom = "text",
> aes(label=paste(round(perc*100),"%")),
> vjust=5) +
> scale_y_continuous(labels = percent)
>
> but I get the error:
>
> Error: stat_bin() must not be used with a y aesthetic.
>
> When I leave out the stat_bin, I get the correct bar chart, but without the labels. Can someone please help me understand what is causing the error above?
>
>
> Thank you kindly,
>
> Shawn Way, PE
>
> ______________________________________________
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html>
> and provide commented, minimal, self-contained, reproducible code.
>
>
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>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
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