5.5 Geometic Objects

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

ggplot(data = mpg) + geom_smooth(mapping = aes(x = displ, y = hwy))
## `geom_smooth()` using method = 'loess'

ggplot(data = mpg) + geom_smooth(mapping = aes(x = displ, y = hwy, linetime = drv))
## Warning: Ignoring unknown aesthetics: linetime
## `geom_smooth()` using method = 'loess'

# base plot before groupings
ggplot(data = mpg) + geom_smooth(mapping = aes(x = displ, y = hwy))
## `geom_smooth()` using method = 'loess'

# base plot before groupings
ggplot(data = mpg) + geom_smooth(mapping = aes(x = displ, y = hwy))
## `geom_smooth()` using method = 'loess'

# separate smoothing line by group
ggplot(data = mpg) + geom_smooth(mapping = aes(x = displ, y = hwy, group = drv))
## `geom_smooth()` using method = 'loess'

# different color foe each group
ggplot(data = mpg) + geom_smooth(mapping = aes(x = displ, y = hwy, color = drv), show.legend = FALSE)
## `geom_smooth()` using method = 'loess'

Adding multiple geoms in the same plot

ggplot(data = mpg) +
  geom_point(mapping = aes(x = displ, y = hwy)) +
  geom_smooth(mapping = aes(x = displ, y = hwy))
## `geom_smooth()` using method = 'loess'

The layering system will carry over values from the previous layer. the ggplot layer will specify the global values

ggplot(data = mpg, mapping = aes(x = displ, y = hwy)) +
  geom_point() +
  geom_smooth()
## `geom_smooth()` using method = 'loess'

Mappings in a a geom function, will overwrite the global settings (i.e., they are local settings)

ggplot(data = mpg, mapping = aes(x = displ, y = hwy)) +
  geom_point(mapping = aes(color = class)) +
  geom_smooth()
## `geom_smooth()` using method = 'loess'

ggplot(data = mpg, mapping = aes(x = displ, y = hwy)) +
  geom_point(mapping = aes(color = class)) +
  geom_smooth(
    data = dplyr::filter(mpg, class == 'subcompact'),
    se = FALSE
  )
## `geom_smooth()` using method = 'loess'