Scatterplots

Show mpg on console

mpg

## # A tibble: 234 x 11
##    manufac… model   displ  year   cyl trans  drv     cty   hwy fl    class
##    <chr>    <chr>   <dbl> <int> <int> <chr>  <chr> <int> <int> <chr> <chr>
##  1 audi     a4       1.80  1999     4 auto(… f        18    29 p     comp…
##  2 audi     a4       1.80  1999     4 manua… f        21    29 p     comp…
##  3 audi     a4       2.00  2008     4 manua… f        20    31 p     comp…
##  4 audi     a4       2.00  2008     4 auto(… f        21    30 p     comp…
##  5 audi     a4       2.80  1999     6 auto(… f        16    26 p     comp…
##  6 audi     a4       2.80  1999     6 manua… f        18    26 p     comp…
##  7 audi     a4       3.10  2008     6 auto(… f        18    27 p     comp…
##  8 audi     a4 qua…  1.80  1999     4 manua… 4        18    26 p     comp…
##  9 audi     a4 qua…  1.80  1999     4 auto(… 4        16    25 p     comp…
## 10 audi     a4 qua…  2.00  2008     4 manua… 4        20    28 p     comp…
## # ... with 224 more rows

RStudio’s view pane

View(mpg)

• Filtering works by clicking on the “Filter” button, then entering a text (for text columns) or restricting the range of values (for numeric columns).
• Arranging works as usual by clicking on a column header. Because the sort operation is stable, you can sort by two variables by first sorting by the second variable, then by the first.
• The 1999 VW Jetta 1.9 and VW New Beetle 1.9 have the best highway economy, both will drive you 44 miles for each gallon of fuel.
• Note that the view pane currently shows at most 100 columns.

Scatterplots

ggplot(data = mpg) +
  geom_point(mapping = aes(x = displ, y = hwy))

More examples:

ggplot(data = mpg) +
  geom_point(mapping = aes(x = cyl, y = drv))

ggplot(data = mpg) +
  geom_point(mapping = aes(x = year, y = cyl))

ggplot(data = mpg) +
  geom_point(mapping = aes(x = displ, y = manufacturer))

ggplot(data = mpg) +
  geom_point(mapping = aes(x = cty, y = hwy))

Convert units

ggplot(data = mpg) +
  geom_point(mapping = aes(x = displ, y = 235 / hwy))