# 1 Overview

Both challenges are due by noon via Sakai on Wednesday May 2. For the first tidy challenge, you’ll want to refer back to our slides. For the second challenge, you’ll want to refer to the reference lab.

1. Tidy challenge: Tidy the “Lord of the Rings” data (Advice: read in each csv file using read_csv(), then use dplyr::bind_rows to stack them together pre-tidying.)

Install and load the gapminder data package. This is the same data that was used in your Datacamp “Introduction to the Tidyverse” course!

install.packages("gapminder")
library(gapminder)
?gapminder

Pick at least two of the tasks below from the task menu and approach each with a table and figure.

• dplyr should be your main data manipulation tool
• ggplot2 should be your main visualization tool

Make observations about what your tables/figures show and about the process. If you want to do something comparable but different, i.e. swap one quantitative variable for another- go for it!

You do not have to use tidyr or otherwise worry about reshaping your tables. Many of your tables may not be formatted perfectly in the report. Simply printing dplyr tabular output is fine. For all things, graphical and tabular, if you’re dissatisfied with a result, discuss the problem, what you tried to do to fix it, and move on.

• Get the maximum and minimum of GDP per capita for all continents.

• Look at the spread of GDP per capita across countries within the continents.

• How does life expectancy vary across different continents?

• Report the absolute and/or relative abundance of countries with low life expectancy over time by continent: Compute some measure of worldwide life expectancy - you decide - a mean or median or some other quantile or perhaps your current age. Then determine how many countries on each continent have a life expectancy less than this benchmark, for each year.

For each table, make sure to include a relevant figure. One tip for starting is to draw out on paper what you want your x- and y-axis to be first and what your geom is; that is, start by drawing the plot you want ggplot to give you. Your figure does not have to depict every single number present in the table. Use your judgement. It just needs to complement the table, add context, and allow for some sanity checking.