Advanced Worksheet

Package and Data Loading

As mentioned within the session setup, load the following packages using the library() function. Additionally, as we will be using a data set with large numbers, set scipen to 999 using the option function.


  options(scipen = 999)

Furthermore, for the purpose of this session, we will be using data from the World Bank Open Data. In particular we will be using a collection of variables from 1999, these variables were selected to provide us plenty of room to explore!

It is included in your downloaded zip file from the accompanying Github Repo and can be loaded using the following code:

WDB_1999 <- read_csv("data/WDB_1999.csv")

Section 1: ggplot2 vs plot

Exercise 1: Plotting birthrate against deathrate using both the plot() and ggplot() function, discuss which has more potential in displaying data clearly.

Exercise 2: Expand the plot to group these points by Continent, which provides us with more information and is easier to achieve? Remember, you’ll need to recode WDB_1999$Continent as a factor using the function:

WDB_1999$Continent <- as.factor(WDB_1999$Continent)

Section 2: Scatter Plots in ggplot

Exercise 3: Change the size parameter to ed.years to see if there is a trend between amount of years in Education and the Birth and Death Rate, set the alpha parameter to 0.5 to clearly see the relationships.

Exercise 4: Change the Labels on the X and Y axis’ and provide a suitable title for the graph

Section 3: Bar Charts and Histograms

Exercise 5: Using the parameter stat = "identity" within the geom_bar() function, create a bar chart of Continent plotted against the mean birthrate or deathrate

Exercise 6: Using the function geom_histogram() create a histogram of the birthrate and deathrate

Section 4: Adding density plots to Histograms

Exercise 7: Using the plot created in exercise 6, add the y-variable ..density.. and binwidth = 1 to geom_histogram() in addition to adding geom_density() to add density lines to the Histogram

Exercise 8: Add the parameter, adjust = 2 in the density plot, to smooth this link and make it more easily interpretable

Section 5: Extra Useful Tips and Functions

Exercise 9: Add a legends() and breaks() to a plot

Exercise 10: Use the ggsave() function to save your last plot