[R] Should help of estimate in t.test be corrected?
PIKAL Petr
petr@p|k@| @end|ng |rom prechez@@cz
Mon Apr 3 14:23:12 CEST 2023
Hallo,
you are probably right that
"the estimated mean or difference in means depending on whether it was a one-sample test or a two-sample test"
should be rephrased to
"the estimated mean or difference in means depending on whether it was a one-sample test, two-sample test or two sample paired test"
Cheers
Petr
> -----Original Message-----
> From: Samuel Granjeaud IR/Inserm <samuel.granjeaud using inserm.fr>
> Sent: Monday, April 3, 2023 1:25 PM
> To: PIKAL Petr <petr.pikal using precheza.cz>; r-help using r-project.org
> Subject: Re: [R] Should help of estimate in t.test be corrected?
>
> 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)$estimate
> > mean difference
> > -5
> >
> > Cheers
> > Petr
> >
> >> -----Original Message-----
> >> From: R-help <r-help-bounces using r-project.org> On Behalf Of Samuel
> >> Granjeaud IR/Inserm
> >> Sent: Sunday, April 2, 2023 11:39 PM
> >> To: r-help using r-project.org
> >> Subject: [R] Should help of estimate in t.test be corrected?
> >>
> >> Hi,
> >>
> >> Not important, but IMHO the estimate component of the t.test holds an
> >> estimate of mean of each group, never a difference. The doc says
> >> "estimate the estimated mean or difference in means depending on
> whether
> >> it
> >> was a one-sample test or a two-sample test."
> >>
> >> > t.test(0:4)$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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