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How to Produce Stratified Boxplots in R (R Tutorial 2.2b) Video Lecture | Mastering R Programming: For Data Science and Analytics - Database Management

51 videos
Video Timeline
Video Timeline
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00:06 When to use Stratified (Side by Side) Box Plots
00:17 Introducing the example & data that is used in this video
01:15 How to make a boxplot for a single variable
01:22 How to modify the appearance of a box plot to visually represent our data better
01:44 How to make side-by-side boxplots to compare groups using ~
02:22 A brief introduction to confound effect
02:54 How to create a boxplot for a subset of data using square brackets
03:40 How to create boxplots comparing groups that are stratified by Age (a third variable)
05:09 How to modify the stratified boxplot to visually present our data better
06:02 How to add colours to help separate the groups in our boxplot
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FAQs on How to Produce Stratified Boxplots in R (R Tutorial 2.2b) Video Lecture - Mastering R Programming: For Data Science and Analytics - Database Management

1. How do I create stratified boxplots in R?
Ans. To create stratified boxplots in R, you can use the "ggplot2" package. First, load the package using the command: `library(ggplot2)`. Then, use the `ggplot()` function to create a basic plot and specify the data and aesthetics. Finally, use the `geom_boxplot()` function to add the boxplots to the plot. To stratify the boxplots, you can use the `facet_grid()` or `facet_wrap()` functions to split the plots by a categorical variable.
2. Can you provide an example code to produce stratified boxplots in R?
Ans. Sure! Here's an example code to produce stratified boxplots in R: ``` # Load the ggplot2 package library(ggplot2) # Create a basic plot p <- ggplot(data, aes(x = variable, y = value)) # Add boxplots p <- p + geom_boxplot() # Stratify the boxplots by a categorical variable p <- p + facet_grid(. ~ category) # Display the plot print(p) ``` Make sure to replace "data" with your actual dataset, "variable" with the variable you want to display on the x-axis, "value" with the variable you want to display on the y-axis, and "category" with the categorical variable you want to use for stratification.
3. How can I customize the appearance of stratified boxplots in R?
Ans. You can customize the appearance of stratified boxplots in R using various options provided by the "ggplot2" package. Some common customization options include changing the colors, adding titles and labels, adjusting the axis limits, and modifying the legend. You can use functions such as `theme()`, `scale_fill_manual()`, `scale_color_manual()`, and `labs()` to customize different aspects of the plot. Additionally, you can explore the documentation of the "ggplot2" package for more advanced customization options.
4. Is it possible to add statistical summaries to the stratified boxplots in R?
Ans. Yes, it is possible to add statistical summaries to the stratified boxplots in R. The "ggplot2" package provides several functions to add statistical summaries, such as the mean, median, standard deviation, or confidence intervals, to the boxplots. You can use functions such as `stat_summary()` or `geom_crossbar()` to add these summaries. Additionally, you can customize the appearance of the summaries using various options provided by the package.
5. Can I save the stratified boxplots as an image file in R?
Ans. Yes, you can save the stratified boxplots as an image file in R. After creating the plot using the "ggplot2" package, you can use the `ggsave()` function to save the plot as an image file. The `ggsave()` function allows you to specify the filename, file format (e.g., PNG, PDF, JPEG), width, height, and other options for the saved image. For example, you can use the following code to save the plot as a PNG file: ``` ggsave(filename = "stratified_boxplot.png", plot = p, width = 6, height = 4, dpi = 300) ``` Make sure to replace "p" with the name of your plot object and adjust the width, height, and dpi values according to your preferences.
Video Timeline
Video Timeline
arrow
00:06 When to use Stratified (Side by Side) Box Plots
00:17 Introducing the example & data that is used in this video
01:15 How to make a boxplot for a single variable
01:22 How to modify the appearance of a box plot to visually represent our data better
01:44 How to make side-by-side boxplots to compare groups using ~
02:22 A brief introduction to confound effect
02:54 How to create a boxplot for a subset of data using square brackets
03:40 How to create boxplots comparing groups that are stratified by Age (a third variable)
05:09 How to modify the stratified boxplot to visually present our data better
06:02 How to add colours to help separate the groups in our boxplot
More
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