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Created January 31, 2019 03:57
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glimpse dplyr 2
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.R
# 4. create new columns
mtcars %>% mutate(hp_2 = hp * 2)
mtcars %>% mutate(log_hp = log(hp))
# 5. summarise statistics
mtcars %>%
summarise(mean_hp = mean(hp),
sd_hp = sd(hp),
n = n())
# 6. group_by() always used with summarise()
mtcars %>%
group_by(am) %>%
summarise(mean_hp = mean(hp))
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