How to extract the t-value as a bare number in R?

Question

I've tried to unname() and use [[1]] to only extract the numeric value of t reported after a t.test() with no success.

I was wondering how I could extract the numeric value of t in a t.test command in R?

Here is an example:

t.value = unname(t.test(extra ~ group, var.equal = T, data = sleep))[[1]]

(gt = t.value / .2)  ## When you run this

#>         t   ## You see this extra `t` here, how to avoid getting this `t`?
#  -9.304067 

Answer 1

The unname should be after the extraction

t.value <- unname(t.test(extra ~ group, var.equal = T, data = sleep)[[1]])
t.value
#[1] -1.860813

Or other option is

t.test(extra ~ group, var.equal = T, data = sleep)$statistic[["t"]]
#[1] -1.860813

Or we can use as.numeric

---

In the OP's code, it is unnameing the list elements

t.valueO <- t.test(extra ~ group, var.equal = T, data = sleep)
names(t.valueO)
#[1] "statistic"   "parameter"   "p.value"     "conf.int"    "estimate"    "null.value"  "alternative" "method"     
#[9] "data.name"  

names(unname(t.valueO))
#NULL