Adjusting the bin numbers
Let's take our first steps away from the default number of bins with our histograms. We'll start by building a histogram of the percentage of the speed a driver is traveling over the limit for each citation. This is calculated as ((speed - speed_limit) / speed_limit)*100
.
Plot percentage over the speed limit as a histogram with the number of bins set to 40. While you're at it, set the alpha
to 0.8
. You're entirely on your own with this one, no scaffolding.
This exercise is part of the course
Visualization Best Practices in R
Exercise instructions
- Load
md_speeding
intoggplot()
object. - Add a histogram geometry to plot.
- Set x
aes()
thetic topercentage_over_limit
. - Adjust settings for 40
bins
and setalpha
as0.8
.
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
# Load md_speeding into ggplot
___ +
# add a geom_histogram with x mapped to percentage_over_limit
___(
___
___ # set bin number to 40
___) # reduce alpha to 0.8