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rloopsfor-loopt-test
Philipp Staudacher
Philipp Staudacher

Reputation: 175

Loop t.test over columns in R

I have a numeric and several binary variables. I'd like to loop a ttest for each binary variable.

Using

library(boot)
df <- nuclear

both

  t.test(df$cost, df[6])

and

  t.test(df$cost, df$pr)

give me the same result. However, If I want to loop it, I'll do the following:

for(i in 6:9) {
  t.test(df$cost, df[i])
}

which then doesnt give any output.

How can I get a result here and why is this output supressed?

Upvotes: 0

Views: 695

Answers (2)

Jan
Jan

Reputation: 5254

If it is just about the missing output, you only need to add print.

library(boot)
df <- nuclear
for(i in 6:9) {
  print(t.test(df$cost, df[i]))
}

Upvotes: 1

Henry Cyranka
Henry Cyranka

Reputation: 3060

Solution using lapply:

library(boot)

df <- nuclear 


list_of_ttests <- lapply(6:9, function(i){
    t.test(df[,1], df[,i])
})

This generates a list of t-tests and saves them to a list.

Upvotes: 2

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