[R] Should help of estimate in t.test be corrected?

[Samuel Granjeaud IR/Inserm]

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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