R: Names of features not appearing when using table()

user_12463547 0
Viewed 58

I am using the following command that returns this output:

> table(data$Smoke, data$Gender)
     
      female male
  no     314  334
  yes     44   33

Nonetheless, in the tutorial I'm watching, the instructor uses the same line of code and they get

      Gender
Smoke   female male
  no     314  334
  yes     44   33

How can I achieve this result? It's not clear from the help menu.

r
2 Answers

You can name the vectors you pass to table.

table(Smoke = c('no','yes'), Gender = c('male','female'))

#-----
     Gender
Smoke female male
  no       0    1
  yes      1    0
user_124003850

Just pass a two-column data.frame object to table()

table(data[c("Smoke", "Gender")])

#      Gender
# Smoke female male
#   no      29   31
#   yes     17   23

or use xtabs():

xtabs( ~ Smoke + Gender, data)

#      Gender
# Smoke female male
#   no      29   31
#   yes     17   23

Although the following one also works, it looks some rude.

table(Smoke = data$Smoke, Gender = data$Gender)

Data

data <- data.frame(id = 1:100,
                   Smoke = sample(c("no", "yes"), 100, T),
                   Gender = sample(c("female", "male"), 100, T))
user_100689850
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