Here is a short quiz that reviews some of the concepts from the fourth session.
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1. Which function converts wide data to long data?
gather()
ddply()
summarize()
convert()
2. Fill in the blank below.
The str() function shows us the of the data.
4. Fill in the blank below.
In graphics, transparency is called , where 0 is entirely transparent, and the default of 1 is entirely opaque.
5. Match the function names to their descriptions.
3. Which of these functions are the “bare bones” of ggplot2? Select all that apply
ggplot()
aes()
geom()
fill()
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