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Language of data 数据语言
用data()导入dataset
droplevels()把没用的levels去除掉
一般可以用table()查看levels
ifelse(test, yes, no)
test为真，输出yes值，否则输出no值。
email50_fortified <- email50 %>%
mutate(number_yn = case_when(
number == "none" ~ "no",
number != "none" ~ "yes"
)
)
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Sampling strategies and experimental design
sample_n()随机抽样
x = case_when(
[condition 1] ~ [value of x when condition 1 is true],
[condition 2] ~ [value of x when condition 2 is true],
[condition 3] ~ [value of x when condition 3 is true]
)
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