Count and Percent Together using Stack Bar in R - r

Question

I am trying to create stack bar with counts and percent in same graph. I took help from Showing data values on stacked bar chart in ggplot2 and add group total and plotted my as
By using code
### to plot stacked bar graph with total on the top and
### distribution of the frequency;
library(ggplot2);
library(plyr);
library(dplyr);
Year <- c(rep(c("2006-07", "2007-08", "2008-09", "2009-10"), each = 4))
Category <- c(rep(c("A", "B", "C", "D"), times = 4))
Frequency <- c(168, 259, 226, 340, 216, 431, 319, 368, 423, 645, 234, 685, 166, 467, 274, 251)
Data <- data.frame(Year, Category, Frequency);
sum_count <-
Data %>%
group_by(Year) %>%
summarise(max_pos = sum(Frequency));
sum_count;
Data <- ddply(Data, .(Year), transform, pos =
cumsum(Frequency) - (0.5 * Frequency));
Data;
# plot bars and add text
p <- ggplot(Data, aes(x = Year, y = Frequency)) +
geom_bar(aes(fill = Category), stat="identity") +
geom_text(aes(label=Frequency,y = pos), size = 3) +
geom_text(data = sum_count,
aes(y = max_pos, label = max_pos), size = 4,
vjust = -0.5);
print(p);
/Now I want to overlay percent of each group with counts This is my approach.merge data such a way that we can calculate
% for each of the group you are dealing with/
MergeData <- merge(Data,sum_count,by="Year");
MergeData <- transform(MergeData,
per_cent=round((pos/max_pos)*100,0));
MergeData<- ddply(MergeData, .(Year), transform, per_pos =
cumsum(per_cent) - (0.5 * per_cent));
# calculate percent and attach % sign;
MergeData <- transform(MergeData,
per_cent=paste(round((pos/max_pos)*100,0),"%"));
# Data only with percents
Percent_Data <- subset(MergeData,select
= c("Year","Category","per_cent","per_pos"));
/I am wondering if it is possible to overlay percent data to the image I created using previous code so that number and percent can be presented together./

Answer 1

I think you are almost there.
Use MergeData as the source for the data frame and add one more call to geom_text
p <- ggplot(MergeData, aes(x = Year, y = Frequency, group = Category)) +
geom_bar(aes(fill = Category), stat="identity") +
geom_text(aes(label=Frequency,y = pos), size = 3, vjust = 1) +
geom_text(
aes(y = max_pos, label = max_pos), size = 4,
vjust = -.5) +
geom_text(aes(x = Year, y = pos, label = per_cent), vjust = -1, size = 4)
print(p);
You may need to fiddle with hjust and vjust to get the text just how you like it.

Answer 2

Thank you for your response. I think it is very good.
p <- ggplot(MergeData, aes(x = Year, y = Frequency, group = Category)) +
geom_bar(aes(fill = Category), stat="identity") +
geom_text(aes(label=Frequency,y = pos), vjust = 1,size = 2,hjust = 0.5) +
geom_text(aes(y = max_pos, label = max_pos), size = 3,vjust = -.1) +
geom_text(aes(x = Year, y = pos, label = per_cent), vjust = -.4, size = 2)+
xlab("Year") + ylab(" Number of People") + # Set axis labels
ggtitle("Distribution by Category over Year") + # Set title
theme(panel.background =
element_rect(fill = 'white', colour = 'white'),
legend.position = "bottom" ,
legend.title = element_text(color="black",
size=7),
legend.key.width = unit(1,"inch") );
print(p);
now my % on top of number numbers,in other words, it is "17%" and "168" but I want "168" and "17%". I tried switching position of geom_text() but it did not work. I am wondering if you know how to fix it.

Answer 3

Yes it helped. I fixed number to make center of each stack. therefore i needed to make change in percent below code fixed my issue. Thank you so much for your help.
p <- ggplot(MergeData, aes(x = Year, y = Frequency, group = Category)) +
geom_bar(aes(fill = Category), stat="identity") +
geom_text(aes(label=Frequency,y = pos), vjust = 1,
size = 2,hjust = 0.5) +
geom_text(aes(y = max_pos, label = max_pos), size = 3,vjust = -.1) +
geom_text(aes(x = Year, y = pos, label = per_cent), vjust = 1.95,
size = 2,hjust=0.3)+
xlab("Year") + ylab(" Number of People") + # Set axis labels
ggtitle("Distribution by Category over Year") + # Set title;
theme(panel.background =
element_rect(fill = 'white', colour = 'white'),
legend.position = "bottom" ,
legend.title = element_text(color="black",
size=7) );
print(p);