[R] Power Analysis

From: Schatzi <adele_thompson_at_cargill.com>
Date: Mon, 18 Apr 2011 14:31:19 -0700 (PDT)

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)
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)
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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