I am not saying this is wonderful but this does work:
penguins |>
subset(species != "Gentoo") |>
stats:::t.test.formula(formula = bill_len ~ species)
Also there is a problem with t.test in that methods are not supposed
to have conflicting
signatures but
> args(t.test)
function (x, ...)
NULL
> args(stats:::t.test.formula)
function (formula, data, subset, na.action = na.pass, ...)
NULL
On Tue, Jun 10, 2025 at 6:39 AM Måns Thulin <gausseliminer...@gmail.com> wrote:
>
> To use functions for common statistical tests/models, like t.test,
> wilcox.test, lm, glm, and aov, we must currently use the pipe placeholder _
> when using pipes:
>
> penguins |>
> subset(species != "Gentoo") |>
> t.test(bill_len ~ species, data = _)
>
> The syntax would be cleaner and perhaps more intuitive if we didn't have to
> add the `data = _` bit:
>
> penguins |>
> subset(species != "Gentoo") |>
> t.test(bill_len ~ species)
>
> I believe that this is how t.test and the other functions I mentioned would
> have worked if they'd been written after the base pipe was introduced.
>
> Currently, t.test and friends only accept a vector and/or a formula as
> their first argument. Since there already is a formula method for these
> functions, a simple way to make the second example above work would be to
> define a data.frame method like so:
>
> t.test.data.frame <- function(x, formula, ...)
> {
> t.test.formula(formula, x, ...)
> }
>
> ...perhaps with a check to make sure that the formula argument actually is
> a formula.
>
> Now, this seems like an easy thing to fix, and it doesn't break any
> existing functionality of these functions. Since the base pipe was
> introduced four years ago, I suspect that there might be some reason why
> this hasn't been implemented already, and I'm curious to find out what that
> is. Or, if there is support for the idea above, I'd be happy to submit a
> feature request in Bugzilla and provide code for implementing this.
>
> Best regards,
> Måns
>
> [[alternative HTML version deleted]]
>
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