Dear Kaveh,
Take a look at http://www.statmethods.net/stats/power.html
HTH,
Jorge.-
On Thu, Jan 10, 2013 at 3:21 PM, Kaveh Zakeri <> wrote:
> Hello,
>
> I am trying to get the power function to report the sample size rather
> than the power. My goal is to input a variety of values for theta and then
> for the power function to report the corresponding sample sizes. I haven't
> had much luck trying to create my own function, something along the lines
> of:
>
> f <- function (x) {
>
> power(N=z,a=6,f=6,pi=.5,alpha=.1,t0=10,theta=(1/x),CIFev0=.476,CIFcr0=0))=0.8
> read(z)
> }
>
> In the above example, I am trying to fix the power at 0.80 and solve for
> z, which is the sample size. I would like x to be a random distribution of
> thetas. For instance:
>
> x=rnorm(30,.5,.2)
>
> and then receive the 30 corresponding sample sizes.
>
> Thank you!
>
> [[alternative HTML version deleted]]
>
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>
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