COMP4010 Solution

COMP4010/5120 Data Visualization - Homework 2 Question Set
This assignment introduces you to a new type of plot called ridgeline plot, and also require you to apply the skills you have learned so far in the course. We will be using the same fictional VinUni enrolment data from Week 5 AE, plus some Vietnam population data to construct a population pyramid plot.
Submission requirements
Similar to the weekly AEs and prior homeworks, you should submit your work in 2 formats: Rmd and pdf to Canvas. Answers for non-coding questions should be added in the file as plain text.
Task 1: Creating a ridgeline plot for VinUni enrolment data
Summary of task requirements
Recreate the example plot to the best of your ability (minor differences like font size and figure size are accepted). Provide a short comment about what information you are able to intepret from this ridgeline plot.
Task description
Recreate the following plot to the best of your ability (minor differences like font size and figure size are accepted), and provide a short comment about what information you are able to intepret from this ridgeline plot:

You should do this by creating a function called theme_college_stats() to store your theme for the following exercises. In particular, the theme should have the following properties:
Centered and bold plot title.
Only y-axis major grid lines are visible.
Axis title and ticks labels should be bold.
Font size should be readable and does not need to be identical to the example plot provided above.
Additionally, the font family used in the above plot is Open Sans from Google Font. The color palette used for color coding the colleges is: #78d6ff for CAS, #ffee54 for CBM, #992212 for CECS, and #117024 for CHS.
Finally, please provide a short comment about what information you are able to intepret from this ridgeline plot.
Task 2: Creating a bar chart for 2118 VinUni data
Summary of task requirements
Filter the VinUni enrolment data to extract only data from the year 2118.
Recreate the example plot to the best of your ability (minor differences like font size and figure size are accepted).
Task description
Recreate the following plot to the best of your ability (minor differences like font size and figure size are accepted):

Task 3: Creating a pie chart for 2118 VinUni data
Summary of task requirements
Recreate the example plot to the best of your ability (minor differences like font size and figure size are accepted).
Provide a short comment comparing the effectiveness of the pie chart and the bar chart from Task 2 to represent the same data.
Task description
Recreate the following plot to the best of your ability (minor differences like font size and figure size are accepted):

Hint: If you're unsure how to create this pie chart, check out coord_polar() documentation.
Task 4: Creating population pyramids for Vietnam data from 1975 to 2025
Summary of task requirements
Create a series of 11 individual population pyramid plots for Vietnam from 1975 to 2025.
Create a theme to style the plots as close as possible to the example plot provided below (you can use other color schemes).
Provide a comment describing what information does a population pyramid of a year tell you?
Provide a comment, based on the 11 plots, describing your idea of what is going on with the population in Vietnam? Optional: Provide your hypothesis/explanation to why that is happening.
Task description

Please try to recreate the plot to the best of your ability. You can pick any color schemes you would like for your plot. In the example plot above, the colors #109466 and #112e80 are used for female and male respectively.
To avoid copy and pasting a lot of code, you can create a function called create_population_pyramid(file_name) to generate a population pyramid with the defined style and theme for a given data file.
Please describe what information does a population pyramid of a year tell you? Based on the 11 plots you've just generated, describe your idea of what is going on with the population in Vietnam? Optional: Provide your hypothesis/explanation to why that is happening.
Task 5: Creating line graph for Vietnamese total population count from 1975 to 2025
Summary of task requirements
Create a line graph for Vietnamese total population count from 1975 to 2025.
Task description
Recreate the following plot to the best of your ability (minor differences like font size and figure size are accepted):

You can pick any color schemes you would like for your plot. In the example plot above, the color #112e80 is used for the lines and points and #999999 is used for the dashed line.
Task 6: Your own Hall of Fame/Shame
Find an interesting data visualization online and provide a critique of it. It can be a great visualization or a terrible one, up to you!
In 3-4 sentences:
Provide and introduction to the visualization and an image of it along with proper credit/citation. To insert an image in R Markdown, use: !
[Caption for the picture.](/path/to/image.png)
Describe the purpose of the visualization and the question it is attempting to answer.
In bullet points: identify the strengths and weaknesses of the visualization.
In two to three paragraphs (80-150 words): give a critique/analysis/constructive comments about the visualization. Apply the you knowledge of effective visualization and what you've have learned in the course to your analysis. Can you suggest some improvements that can be made to the visualization?
Side note: inserting an image in R Markdown should look something like this: