[R] Power Analysis

[Schatzi]

I am trying to do a power analysis to get the number of replicas per
treatment.

If I try to get the power it works just fine:
setn=c(2,3)
sdx=c(1.19,4.35)
power.t.test(n = setn, delta = 13.5, sd = sdx, sig.level = 0.05,power =
NULL)

If I go the other way to obtain the "n" I have problems.
sdx=c(1.19,4.35)
pow=c(.8,.8)
power.t.test(n = NULL, delta = 13.5, sd = sdx, sig.level = 0.05, power =
0.8)

Is there any way to do this? Thank you.

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