11.18 Bar Chart Stacked

20210413

ds %>%
  ggplot(aes(x=wind_dir_3pm, fill=rain_tomorrow)) +
  geom_bar() +
  scale_y_continuous(labels=comma) +
  labs(x=vnames["wind_dir_3pm"], y="Count") +
  scale_fill_brewer(palette="Set2")

A stacked bar chart shows a breakdown of the values in the bars based on another variable. It is achieved by adding fill=rain_tomorrow to the basic bar chart of Section ??.

An issue with stacked bar charts is that whilst the bottom bars are easy to compare bar by bar, the tops are difficult to compare since they all start from a different baseline. A good alternative is to have both bars in a column but side-by-side, as in Section 11.7.

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