September 2018
Beginner
206 pages
4h 27m
English
Content preview from R Programming Fundamentals
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Histogram
When you have one continuous variable, it's a good idea to use a histogram to get an idea of its distribution. The height of the bar of the histogram corresponds to the number of observations that have that value. We can create a histogram of the mpg variable in mtcars using the following code:
ggplot(mtcars, aes(mpg)) + geom_histogram()
This code will throw a warning:
'stat_bin()' using 'bins = 30'. Pick better value with 'binwidth'.
The default number of bins is always 30, and you should always change it and find a better value for your data. The default means that it takes the range of the data (here, mpg is between 10.4 and ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.