On 4/14/2008 6:21 AM, Louisa Hay wrote:
>
> Hi,
> I am trying to create a power curve to show how the power of a t-test varies
> depending on the mean. Any ideas how I should go about this?
> Louisa
Something like this maybe?
mydiffs <- seq(.05,1,.05)
mypower <- vector("numeric", 20)
for(i in 1:20){
mypower[i] <- power.t.test(n=100, sd=1, delta=mydiffs[i])$power
}
plot(mymeans, mypower, xlab="delta", ylab="Power", type="b")
See ?power.t.test
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