What do you mean by "power curves" ? Is it the power of a study as the effect size varies or power output of a machine with some other parameter ? I usually generate a sequence of numbers (for the x-axis) that spans the range of interest and calculate its output. # Example 1 f <- function(x) sin(x) x <- seq(0, 10, by=0.01) y <- f(x) plot(x, y, type="l") Or you can call plot(f, xlim=c(0, 10) ) # Example 2 plot(2:100, power.t.test(2:100, delta=1, sd=1, sig.level=0.05)$power) Regards, Adai
On Mon, 2004-11-15 at 01:19, Duncan Harris wrote:
How do I draw/calculate power curves in R? Cheers, Duncan.
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