Greg Snow:
> Look at the pwr package, it has functions for 2 samples of different
> sizes.
>
> Hope this helps,
Great! Thanks.
--
Karl Ove Hufthammer
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p-boun...@r-
> project.org] On Behalf Of Karl Ove Hufthammer
> Sent: Friday, April 24, 2009 2:41 AM
> To: r-h...@stat.math.ethz.ch
> Subject: Re: [R] power.t.test formula
>
> Peter Dalgaard:
>
> >> Does anyone of you knows a reference for the formula used in
> powe
Usuario R wrote:
> Hello,
> Thank you, but can you understand this result? first I calculate the sd
> for n = 2 and then n with that sd. It should give me 2 right?
>
>> FC = 1.5
>> alfa = 0.01
>> power = 0.85
>> sd1 <- power.t.test( n = 2, delta = FC, sig.level = alfa,
> +pow
Hello,
Thank you, but can you understand this result? first I calculate the sd for
n = 2 and then n with that sd. It should give me 2 right?
> FC = 1.5
> alfa = 0.01
> power = 0.85
> sd1 <- power.t.test( n = 2, delta = FC, sig.level = alfa,
+power = power, type = "two.sample"
Peter Dalgaard:
>> Does anyone of you knows a reference for the formula used in power.t.test
>> function? And also why it uses the Student's distribution instead of
>> Normal. (I know both of them can be used but don't see whether choose one
>> or the other)
>
> It is a straightforward first-pri
Usuario R wrote:
> Hi,
>
> Does anyone of you knows a reference for the formula used in power.t.test
> function? And also why it uses the Student's distribution instead of Normal.
> (I know both of them can be used but don't see whether choose one or the
> other)
It is a straightforward first-pr
Hi,
Does anyone of you knows a reference for the formula used in power.t.test
function? And also why it uses the Student's distribution instead of Normal.
(I know both of them can be used but don't see whether choose one or the
other)
Thank you.
Regards
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