Hi
Thanks for your feedback. I didn't think about that.
Still, the mean difference is computed for paired, not because there are
two samples. IMHO, the help should be updated.
Best,
Samuel
Le 2023-04-03 à 12:10, PIKAL Petr a écrit :
Hi
You need to use paired option
t.test(x=0:4, y=sample(5:9), paired=TRUE)$estimate
mean difference
-5
Cheers
Petr
-----Original Message-----
From: R-help <r-help-boun...@r-project.org> On Behalf Of Samuel Granjeaud
IR/Inserm
Sent: Sunday, April 2, 2023 11:39 PM
To: r-help@r-project.org
Subject: [R] Should help of estimate in t.test be corrected?
Hi,
Not important, but IMHO the estimate component of the t.test holds an
estimate of mean of each group, never a difference. The doc says
"estimate the estimated mean or difference in means depending on whether
it
was a one-sample test or a two-sample test."
> t.test(0:4)$estimate
mean of x
2
> t.test(0:4, 5:9)$estimate
mean of x mean of y
2 7
Best,
Samuel
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