Hi all.
Sorry if this is basic knowlegde but I've spend half a day searching and can't find an answar to my question.
I'm currently trying to do i unparried t-test with some of my data.
It so happens that the variables in question has some NAs. I thought that this would mean that R couldn't performe the test. Just like when you try to calculate a mean for a variable that contains NAs. But R is able to calculate my t-test. So my question is, how does it do it. Is it by listwise deletion, or pairwise deletion? I read that list wise deletion is standard for R. But when I look at my results it looks more like pairwise deletion. And I just don't get it!!
I hope my question makes sense?
Kind regards 