Percent Stacked Bar Plots
The Percent Stacked Bar Plots are used to visualize the contribution or proportion of each categorical variable in while cumulatively taking the primary categorical variable. The entire bar is filled to the top and the different groups occupy the heights corresponding to their proportion in the bar. To map a percent stacked bar plot, the value of the position parameter is specified as “fill”.
Approach:
- Import module
- Create dataframe
- Plot graph with required functions
- Set position parameter to fill in geom_bar( ) function
- Display plot
Syntax :
geom_bar(position = “fill” , ….)
Example:
R
# importing the ggplot2 library library(ggplot2) # creating data frame cities <- c(rep("Delhi", 3), rep("Mumbai", 3), rep("Chennai", 3), rep("Bengaluru", 3)) humidity <- rep(c("High", "Medium", "Low"), 4) temperature <- abs(rnorm(12, 25, 10)) dataframe <- data.frame(cities, humidity, temperature) # calling the dataframe dataframe # plotting graph ggplot(dataframe, aes(fill = humidity, y = temperature, x = cities))+ geom_bar(position = "fill", stat = "identity")+ ggtitle("Weather Data of 4 Cities !")+ theme(plot.title = element_text(hjust = 0.5)) |
Output :
Percent Stacked Bar Plot of Weather Data Set
Grouped, stacked and percent stacked barplot in ggplot2
The ggplot is a library used for generating graphs in R language. We provide the data and specify the aesthetics as to how the specified data should be mapped. It is a very powerful library and widely used to generate comprehensive graphs and plots. It is used for creating graphics based on the “Grammar of Graphics”.
A Bar Plot or Bar Chart is a Data Visualization tool that is widely used to represent the relationship between a numeric and a categorical variable. The numeric variable is generally plotted on the Y-axis and the categorical variable on the horizontal X-axis. The height of the bars represents the corresponding numeric value of the categorical value. The above-mentioned come in handy when we have more than one categorical variable and a numeric variable.
In this article, we will be seeing how we can plot 3 different types of Bar Plots. These 3 different types of Bar Plots are :
- Grouped Bar Plot
- Stacked Bar Plot
- Percent Stacked Bar Plot
The only difference in the codes of the 3 plots is the value of the “position” parameter in the geom_bar() function of the ggplot library. Given below is implementation of the same.
Example :
R
# importing the ggplot2 library library(ggplot2) # creating the cities column # c() is used to combine vectors # rep() is used for replication of values cities <- c(rep("Delhi", 3), rep("Mumbai", 3), rep("Chennai", 3), rep("Bengaluru", 3)) # creating the humidity column # contains 3 classes humidity <- rep(c("High", "Medium", "Low"), 4) # creating the temperature column # abs() is used for getting the absolute value # rnorm() is used for generating random variates # in a normal distribution # rnorm(number of samples, mean, SD) temperature <- abs(rnorm(12, 25, 10)) # dataframe consisting of the three columns dataframe <- data.frame(cities, humidity, temperature) # calling the dataframe dataframe |