Calmcode - dplyr verbs: group


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Once again we assume that you've got the dataframe set up appropriately.


# This command makes sure that the chickweight dataframe is clean.
df <- ChickWeight %>% ungroup() %>%

We see how we can combine verbs to query the data.

df %>%
  filter(Time <= 10) %>%
  group_by(Time, Diet) %>%
  summarise(mean_weight = mean(weight), var_weight = var(weight), n = n())

Note that the image used in this video can originally be found over at software carpentry. It's a pretty cool learning source if you haven't seen it yet!